diff --git a/tools/qfcc/include/diagnostic.h b/tools/qfcc/include/diagnostic.h
index 5b2f3871e..5734d3fc7 100644
--- a/tools/qfcc/include/diagnostic.h
+++ b/tools/qfcc/include/diagnostic.h
@@ -47,7 +47,7 @@ struct expr_s *warning (struct expr_s *e, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
 struct expr_s *notice (struct expr_s *e, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
-void debug (struct expr_s *e, const char *mft, ...)
+void debug (struct expr_s *e, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
 
 //@}