diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9a1077b..9d2c2fe 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -402,6 +402,7 @@
     reader/wgsl/parser_impl_switch_body_test.cc
     reader/wgsl/parser_impl_switch_stmt_test.cc
     reader/wgsl/parser_impl_test.cc
+    reader/wgsl/parser_impl_test_helper.cc
     reader/wgsl/parser_impl_test_helper.h
     reader/wgsl/parser_impl_type_alias_test.cc
     reader/wgsl/parser_impl_type_decl_test.cc