diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 0c1b01ecdae..341dc8bba9b 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -2857,7 +2857,7 @@ parseQuery(Command *cmd)
 	p = sql;
 	while ((p = strchr(p, ':')) != NULL)
 	{
-		char		var[12];
+		char		var[13];
 		char	   *name;
 		int			eaten;