diff --git a/include/build_config/SDL_build_config.h.cmake b/include/build_config/SDL_build_config.h.cmake
index 568e6c6a59..9197c94c3f 100644
--- a/include/build_config/SDL_build_config.h.cmake
+++ b/include/build_config/SDL_build_config.h.cmake
@@ -591,5 +591,6 @@ typedef unsigned int uintptr_t;
 #cmakedefine SDL_DISABLE_SSE2 1
 #cmakedefine SDL_DISABLE_SSE3 1
 #cmakedefine SDL_DISABLE_AVX 1
+#cmakedefine SDL_DISABLE_MMX 1
 
 #endif /* SDL_build_config_h_ */