1 files changed, 1 insertions, 1 deletions
diff --git a/src/util.h b/src/util.h
index 8cc44d5..3d7287a 100644
--- a/src/util.h
+++ b/src/util.h
@@ -21,6 +21,6 @@
 
 /* utility functions */
 void __attribute__((noreturn,format(printf,1,2))) error(const char *fmt, ...);
-void debugf_real(const char*, int, const char*, const char *fmt, ...);
+void __attribute__((format(printf,4,5))) debugf_real(const char*, int, const char*, const char *fmt, ...);
 void remove_cruft(char*);
 void all_upper(char*);