diff --git a/src/parser.ts b/src/parser.ts
index 2d04f1b..52f3116 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -69,7 +69,7 @@ const BINARY_OPERATORS = [
 // TODO: this is GLSL-only, separate language constants
 const TYPE_REGEX = /^(void|bool|float|u?int|[uib]?vec\d|mat\d(x\d)?)$/
 const QUALIFIER_REGEX = /^(const|uniform|in|out|inout|centroid|flat|smooth|invariant|lowp|mediump|highp)$/
-const VARIABLE_REGEX = new RegExp(`${TYPE_REGEX.source}|${QUALIFIER_REGEX.source}`)
+const VARIABLE_REGEX = new RegExp(`${TYPE_REGEX.source}|${QUALIFIER_REGEX.source}|layout`)
 
 const isDeclaration = RegExp.prototype.test.bind(VARIABLE_REGEX)
 
diff --git a/tests/parser.test.ts b/tests/parser.test.ts
index ffa7082..430cf6d 100644
--- a/tests/parser.test.ts
+++ b/tests/parser.test.ts
@@ -164,7 +164,7 @@ describe('parser', () => {
 
     {
       const statement = parse(
-        ' layout(location = 0, component = 1, column_major) flat in mat4 test;',
+        'layout(location = 0, component = 1, column_major) flat in mat4 test;',
       )[0] as VariableDeclaration
       expect(statement).toBeInstanceOf(VariableDeclaration)
       expect(statement.type).toBeInstanceOf(Type)