diff --git a/Sources/_FoundationCShims/include/_CStdlib.h b/Sources/_FoundationCShims/include/_CStdlib.h
index 8967eb7f4..04bb7287e 100644
--- a/Sources/_FoundationCShims/include/_CStdlib.h
+++ b/Sources/_FoundationCShims/include/_CStdlib.h
@@ -122,10 +122,6 @@
 #include <complex.h>
 #endif
 
-#if __has_include(<stdatomic.h>)
-#include <stdatomic.h>
-#endif
-
 #if __has_include(<threads.h>)
 #include <threads.h>
 #endif