diff --git a/util.c b/util.c
index 09135a4..f0e1d87 100644
--- a/util.c
+++ b/util.c
@@ -135,5 +135,6 @@ log_debug(int level, const char *func, const char *msg, ...)
 	va_start(ap, msg);
 	xasprintf(&fmt, "debug%d: %s: %s", level, func, msg);
 	log_msg(fmt, ap);
+	free(fmt);
 	va_end(ap);
 }