diff --git a/src/doomdef.h b/src/doomdef.h
index be24fefda..95f8df2ac 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -107,12 +107,12 @@ extern "C" {
 #if !defined (NDEBUG)
 #define PACKETDROP
 #define PARANOIA
-#define RANGECHECK
+//#define RANGECHECK
 #define ZDEBUG
 #endif
 
 // Uncheck this to compile debugging code
-//#define RANGECHECK
+#define RANGECHECK
 //#ifndef PARANOIA
 //#define PARANOIA // do some tests that never fail but maybe
 // turn this on by make etc.. DEBUGMODE = 1 or use the Debug profile in the VC++ projects