diff --git a/drivers/huaweimodem/gprs-context.c b/drivers/huaweimodem/gprs-context.c
index 7e72ad92..de07b055 100644
--- a/drivers/huaweimodem/gprs-context.c
+++ b/drivers/huaweimodem/gprs-context.c
@@ -255,7 +255,7 @@ static void huawei_gprs_activate_primary(struct ofono_gprs_context *gc,
 {
 	struct gprs_context_data *gcd = ofono_gprs_context_get_data(gc);
 	struct cb_data *cbd = cb_data_new(cb, data);
-	char buf[64];
+	char buf[136];
 
 	/* IPv6 support not implemented */
 	if (ctx->proto != OFONO_GPRS_PROTO_IP)