diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index ce51f9f..822f825 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -396,7 +396,7 @@ fn parse_ident<'input>(input: &mut Input<'input>) -> PResult<'input, TemplateTok
 }
 
 fn ident<'input>(input: &mut Input<'input>) -> PResult<'input, TempleInput> {
-    take_while(1.., char::is_alphanumeric).parse_next(input)
+    take_while(1.., |c: char| c.is_alphanumeric() || "_".contains(c)).parse_next(input)
 }
 
 fn bad_ident<'input>(input: &mut Input<'input>) -> PResult<'input, ()> {
diff --git a/tests/cases/1-parsed@identifiers.snap b/tests/cases/1-parsed@identifiers.snap
new file mode 100644
index 0000000..755d9ec
--- /dev/null
+++ b/tests/cases/1-parsed@identifiers.snap
@@ -0,0 +1,178 @@
+---
+source: tests/file_tests.rs
+expression: parsed
+input_file: tests/cases/identifiers.temple
+---
+ParsedTemplate {
+    tokens: [
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "_name",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "a_name",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "1name",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "_name1",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "_namE",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: "
+            ",
+        },
+        TemplateToken {
+            kind: LeftDelim,
+            source: "{{",
+        },
+        TemplateToken {
+            kind: WantsOutput,
+            source: "=",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: Ident,
+            source: "name1",
+        },
+        TemplateToken {
+            kind: Whitespace,
+            source: " ",
+        },
+        TemplateToken {
+            kind: RightDelim,
+            source: "}}",
+        },
+    ],
+}
diff --git a/tests/cases/2-ast@identifiers.snap b/tests/cases/2-ast@identifiers.snap
new file mode 100644
index 0000000..abfc850
--- /dev/null
+++ b/tests/cases/2-ast@identifiers.snap
@@ -0,0 +1,135 @@
+---
+source: tests/file_tests.rs
+expression: ast
+input_file: tests/cases/identifiers.temple
+---
+TemplateAst {
+    root: [
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "_name",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "a_name",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "1name",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "_name1",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "_namE",
+                },
+            ),
+            post_whitespace: Some(
+                TemplateToken {
+                    kind: Whitespace,
+                    source: "
+                    ",
+                },
+            ),
+        },
+        Interpolation {
+            prev_whitespace: None,
+            wants_output: Some(
+                TemplateToken {
+                    kind: WantsOutput,
+                    source: "=",
+                },
+            ),
+            expression: VariableAccess(
+                TemplateToken {
+                    kind: Ident,
+                    source: "name1",
+                },
+            ),
+            post_whitespace: None,
+        },
+    ],
+}
diff --git a/tests/cases/3-instructions@identifiers.snap b/tests/cases/3-instructions@identifiers.snap
new file mode 100644
index 0000000..482d6a6
--- /dev/null
+++ b/tests/cases/3-instructions@identifiers.snap
@@ -0,0 +1,93 @@
+---
+source: tests/file_tests.rs
+expression: emit
+input_file: tests/cases/identifiers.temple
+---
+[
+    LoadFromContextToSlot {
+        name: "_name",
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 0,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+    LoadFromContextToSlot {
+        name: "a_name",
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 1,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+    LoadFromContextToSlot {
+        name: "1name",
+        slot: VariableSlot {
+            index: 2,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 2,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+    LoadFromContextToSlot {
+        name: "_name1",
+        slot: VariableSlot {
+            index: 3,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 3,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+    LoadFromContextToSlot {
+        name: "_namE",
+        slot: VariableSlot {
+            index: 4,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 4,
+        },
+    },
+    AppendContent {
+        content: "
+        ",
+    },
+    LoadFromContextToSlot {
+        name: "name1",
+        slot: VariableSlot {
+            index: 5,
+        },
+    },
+    EmitFromSlot {
+        slot: VariableSlot {
+            index: 5,
+        },
+    },
+]
diff --git a/tests/cases/4-output@identifiers.snap b/tests/cases/4-output@identifiers.snap
new file mode 100644
index 0000000..67a3f6e
--- /dev/null
+++ b/tests/cases/4-output@identifiers.snap
@@ -0,0 +1,6 @@
+---
+source: tests/file_tests.rs
+expression: output
+input_file: tests/cases/identifiers.temple
+---
+"Foo\nFoo\nFoo\nFoo\nFoo\nFoo"
diff --git a/tests/cases/identifiers.temple b/tests/cases/identifiers.temple
new file mode 100644
index 0000000..570a7b2
--- /dev/null
+++ b/tests/cases/identifiers.temple
@@ -0,0 +1,15 @@
+{
+    "_name": "Foo",
+    "a_name": "Foo",
+    "1name": "Foo",
+    "_name1": "Foo",
+    "_namE": "Foo",
+    "name1": "Foo"
+}
+---
+{{= _name }}
+{{= a_name }}
+{{= 1name }}
+{{= _name1 }}
+{{= _namE }}
+{{= name1 }}
\ No newline at end of file