diff --git a/include/SDL3/SDL_mutex.h b/include/SDL3/SDL_mutex.h
index 78b44aaac..03cb80cfb 100644
--- a/include/SDL3/SDL_mutex.h
+++ b/include/SDL3/SDL_mutex.h
@@ -29,6 +29,7 @@
  */
 
 #include <SDL3/SDL_stdinc.h>
+#include <SDL3/SDL_atomic.h>
 #include <SDL3/SDL_error.h>
 #include <SDL3/SDL_thread.h>