diff --git a/components/gwp_asan/client/lightweight_detector.h b/components/gwp_asan/client/lightweight_detector.h
index 44b09d769..91dc2392c 100644
--- a/components/gwp_asan/client/lightweight_detector.h
+++ b/components/gwp_asan/client/lightweight_detector.h
@@ -9,6 +9,8 @@
 #include "components/gwp_asan/client/export.h"
 #include "components/gwp_asan/common/lightweight_detector_state.h"
 
+#include <atomic>
+
 namespace gwp_asan::internal {
 
 class GWP_ASAN_EXPORT LightweightDetector {