diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 87fb006..ea84909 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -1898,6 +1898,7 @@ top:
 			{
 				case PGRES_COMMAND_OK:
 				case PGRES_TUPLES_OK:
+				case PGRES_EMPTY_QUERY: /* may be used to test overheads */
 					break;		/* OK */
 				default:
 					fprintf(stderr, "client %d aborted in state %d: %s",
