diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 163dcad137f..43841e8eb4b 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -2616,7 +2616,7 @@ parseQuery(Command *cmd, const char *raw_sql)
 	p = sql;
 	while ((p = strchr(p, ':')) != NULL)
 	{
-		char		var[12];
+		char		var[13];
 		char	   *name;
 		int			eaten;