1 files changed, 1 insertions, 0 deletions
diff --git a/trace.c b/trace.c
index 82c00f1..04dbae6 100644
--- a/trace.c
+++ b/trace.c
@@ -10,6 +10,7 @@
 
 enum pack_trace pack_trace = PACK_TRACE_OFF;
 
+ATTRIBUTE_FORMAT(printf, 2, 0)
 static void trace(enum pack_trace level, const char *fmt, va_list va)
 {
 	char *type;