diff --git a/src/video/SDL_vulkan_internal.h b/src/video/SDL_vulkan_internal.h
index 3135eab802..872f3a489c 100644
--- a/src/video/SDL_vulkan_internal.h
+++ b/src/video/SDL_vulkan_internal.h
@@ -24,7 +24,7 @@
 #include "SDL_internal.h"
 
 #if SDL_VIDEO_VULKAN
-#if SDL_LOADSO_DISABLED || SDL_LOADSO_DUMMY
+#if defined(SDL_LOADSO_DISABLED) || SDL_LOADSO_DUMMY
 #error You should not be here.
 #endif