1 files changed, 1 insertions, 0 deletions

diff --git a/src/util/cleanupdelta.c b/src/util/cleanupdelta.c
index 144e0388..4f344350 100644
--- a/src/util/cleanupdelta.c
+++ b/src/util/cleanupdelta.c
@@ -37,6 +37,7 @@ static void cleanup(int signum)
 	exit(signum);
 }
 
+__attribute__((format(printf, 2, 0)))
 static void output_cb(alpm_loglevel_t level, const char *fmt, va_list args)
 {
 	if(strlen(fmt)) {