diff --git a/src/siproxd.c b/src/siproxd.c
index 21f2945..965977a 100644
--- a/src/siproxd.c
+++ b/src/siproxd.c
@@ -384,7 +384,7 @@ int main (int argc, char *argv[])
        * got input, process
        */
       buflen = (size_t)sts;
-      DEBUGC(DBCLASS_BABBLE,"received %i bytes of data", buflen);
+      DEBUGC(DBCLASS_BABBLE,"received %zd bytes of data", buflen);
       ticket.direction=0;
       buff[buflen]='\0';