diff --git a/test/common/flag-utils.h b/test/common/flag-utils.h
index 11de5cc039..cd44b56173 100644
--- a/test/common/flag-utils.h
+++ b/test/common/flag-utils.h
@@ -5,6 +5,8 @@
 #ifndef V8_TEST_COMMON_FLAG_UTILS_H
 #define V8_TEST_COMMON_FLAG_UTILS_H
 
+#include "src/base/macros.h"
+
 namespace v8 {
 namespace internal {
 
@@ -24,8 +26,8 @@ class V8_NODISCARD FlagScope {
 }  // namespace internal
 }  // namespace v8
 
-#define FLAG_VALUE_SCOPE(flag, value)                     \
-  v8::internal::FlagScope<bool> __scope_##flag##__LINE__( \
+#define FLAG_VALUE_SCOPE(flag, value)                              \
+  v8::internal::FlagScope<bool> UNIQUE_IDENTIFIER(__scope_##flag)( \
       &v8::internal::FLAG_##flag, value)
 #define FLAG_SCOPE(flag) FLAG_VALUE_SCOPE(flag, true)