diff --git a/apps/app_dial.c b/apps/app_dial.c
index cceec384bf..91e7325f2e 100644
--- a/apps/app_dial.c
+++ b/apps/app_dial.c
@@ -786,7 +786,7 @@ static int dial_exec_full(struct ast_channel *chan, void *data, struct ast_flags
 	int numcongestion = 0;
 	int numnochan = 0;
 	int cause;
-	char numsubst[AST_MAX_EXTENSION];
+	char numsubst[256];
 	char cidname[AST_MAX_EXTENSION];
 	int privdb_val = 0;
 	unsigned int calldurationlimit = 0;