diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c
index 8ac8ecc0dbb..0d06f0bdc70 100644
--- a/src/backend/utils/init/miscinit.c
+++ b/src/backend/utils/init/miscinit.c
@@ -1094,7 +1094,8 @@ EstimateClientConnectionInfoSpace(void)
  * Serialize MyClientConnectionInfo for use by parallel workers.
  */
 void
-SerializeClientConnectionInfo(Size maxsize, char *start_address)
+SerializeClientConnectionInfo(Size maxsize PG_USED_FOR_ASSERTS_ONLY,
+							  char *start_address)
 {
 	SerializedClientConnectionInfo serialized = {0};