1 files changed, 1 insertions, 1 deletions
diff --git a/cache.h b/cache.h
index 08b23b2ab..2ab1bf938 100644
--- a/cache.h
+++ b/cache.h
@@ -1067,7 +1067,7 @@ extern void alloc_report(void);
 /* trace.c */
 __attribute__((format (printf, 1, 2)))
 extern void trace_printf(const char *format, ...);
-extern void trace_vprintf(const char *format, va_list ap);
+extern void trace_vprintf(const char *key, const char *format, va_list ap);
 __attribute__((format (printf, 2, 3)))
 extern void trace_argv_printf(const char **argv, const char *format, ...);
 extern void trace_repo_setup(const char *prefix);