diff --git a/sbin/ggate/ggatec/ggatec.c b/sbin/ggate/ggatec/ggatec.c
index dfd9506e5e26..0de8504ce3c4 100644
--- a/sbin/ggate/ggatec/ggatec.c
+++ b/sbin/ggate/ggatec/ggatec.c
@@ -534,7 +534,7 @@ g_gatec_rescue(void)
 }
 
 static void
-init_initial_buffer_size()
+init_initial_buffer_size(void)
 {
 	int value;
 	size_t intsize;