diff --git a/include/tradstdc.h b/include/tradstdc.h
index 128a9dca9..6bb60b5bf 100644
--- a/include/tradstdc.h
+++ b/include/tradstdc.h
@@ -373,10 +373,6 @@ typedef genericptr genericptr_t; /* (void *) or (char *) */
 #define DO_DEFINE_NONNULLS
 #endif
 
-#if defined(__DJGPP__) && defined(DO_DEFINE_NONNULLS)
-#undef DO_DEFINE_NONNULLS
-#endif
-
 #if defined(DO_DEFINE_NONNULLS) && !defined(NONNULLS_DEFINED)
 #define NONNULL __attribute__((returns_nonnull))
 #define NONNULLPTRS __attribute__((nonnull))