1 files changed, 1 insertions, 1 deletions

diff --git a/src/util/cleanupdelta.c b/src/util/cleanupdelta.c
index 36a4e072..5d2bbf6c 100644
--- a/src/util/cleanupdelta.c
+++ b/src/util/cleanupdelta.c
@@ -37,7 +37,7 @@ static void cleanup(int signum) {
 	exit(signum);
 }
 
-static void output_cb(pmloglevel_t level, char *fmt, va_list args)
+static void output_cb(pmloglevel_t level, const char *fmt, va_list args)
 {
 	if(strlen(fmt)) {
 		switch(level) {