diff --git a/Quake/miniz.h b/Quake/miniz.h
index 1637620f..266bc4c7 100644
--- a/Quake/miniz.h
+++ b/Quake/miniz.h
@@ -117,6 +117,10 @@
 
 #if 1   /* QUAKESPASM-SPECIFIC CONFIG: */
 
+#ifndef NDEBUG
+#define NDEBUG /* disable assert()s */
+#endif
+
 #if defined(SDL_FRAMEWORK) || defined(NO_SDL_CONFIG)
 #ifdef USE_SDL2
 #include <SDL2/SDL.h>