diff --git a/rcl/src/rcl/stdatomic_helper/gcc/stdatomic.h b/rcl/src/rcl/stdatomic_helper/gcc/stdatomic.h
index 9b6cb20..dd0c674 100644
--- a/rcl/src/rcl/stdatomic_helper/gcc/stdatomic.h
+++ b/rcl/src/rcl/stdatomic_helper/gcc/stdatomic.h
@@ -74,6 +74,11 @@
 #ifndef _STDATOMIC_H_  // NOLINT
 #define _STDATOMIC_H_
 
+#if __cplusplus
+// This will suppress warnings about _Bool not being defined.
+typedef bool _Bool;
+#endif
+
 #include <stddef.h>
 #include <stdint.h>