diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index a51b01a058bd..bbcb33bcaa9d 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -1004,7 +1004,7 @@ gpio_aggregator_make_group(struct config_group *group, const char *name)
 	 * for devices create via legacy sysfs interface.
 	 */
 	if (strncmp(name, AGGREGATOR_LEGACY_PREFIX,
-		    sizeof(AGGREGATOR_LEGACY_PREFIX)) == 0)
+		    sizeof(AGGREGATOR_LEGACY_PREFIX) - 1) == 0)
 		return ERR_PTR(-EINVAL);
 
 	/* arg space is unneeded */