diff --git a/nsprpub/lib/msgc/src/prgcapi.c b/nsprpub/lib/msgc/src/prgcapi.c
index 0c05c8bee921..ba7c5b186a89 100644
--- a/nsprpub/lib/msgc/src/prgcapi.c
+++ b/nsprpub/lib/msgc/src/prgcapi.c
@@ -250,7 +250,9 @@ PR_IMPLEMENT(void) PR_GetEndFinalizeHook(GCEndFinalizeHook **hook, void **arg)
 #ifdef DEBUG
 #include "prprf.h"
 
+#if defined(WIN16)
 static FILE *tracefile = 0;
+#endif
 
 PR_IMPLEMENT(void) GCTrace(char *fmt, ...)
 {