3 files changed, 3 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)) {
diff --git a/src/util/testdb.c b/src/util/testdb.c
index 2017b60f..7b08cb0d 100644
--- a/src/util/testdb.c
+++ b/src/util/testdb.c
@@ -40,6 +40,7 @@ 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)) {
diff --git a/src/util/testpkg.c b/src/util/testpkg.c
index 96400a75..10b2f2c2 100644
--- a/src/util/testpkg.c
+++ b/src/util/testpkg.c
@@ -24,6 +24,7 @@
 
 #define BASENAME "testpkg"
 
+__attribute__((format(printf, 2, 0)))
 static void output_cb(alpm_loglevel_t level, const char *fmt, va_list args)
 {
 	if(fmt[0] == '\0') {