diff --git a/include/SDL_stdinc.h b/include/SDL_stdinc.h
index 16100b8b8..f7ac33a90 100644
--- a/include/SDL_stdinc.h
+++ b/include/SDL_stdinc.h
@@ -376,7 +376,7 @@ extern DECLSPEC int SDLCALL SDL_SetMemoryFunctions(SDL_malloc_func malloc_func,
 /**
  *  \brief Get the number of outstanding (unfreed) allocations
  */
-extern DECLSPEC int SDLCALL SDL_GetNumAllocations();
+extern DECLSPEC int SDLCALL SDL_GetNumAllocations(void);
 
 extern DECLSPEC char *SDLCALL SDL_getenv(const char *name);
 extern DECLSPEC int SDLCALL SDL_setenv(const char *name, const char *value, int overwrite);
diff --git a/src/stdlib/SDL_malloc.c b/src/stdlib/SDL_malloc.c
index c2cb1f3a6..225b19000 100644
--- a/src/stdlib/SDL_malloc.c
+++ b/src/stdlib/SDL_malloc.c
@@ -5312,7 +5312,7 @@ int SDL_SetMemoryFunctions(SDL_malloc_func malloc_func,
     return 0;
 }
 
-int SDL_GetNumAllocations()
+int SDL_GetNumAllocations(void)
 {
     return SDL_AtomicGet(&s_mem.num_allocations);
 }