diff --git a/cmd/sf.c b/cmd/sf.c
index 55bef2f..977ffcb 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -366,7 +366,7 @@
 	}
 
 	if (flash->flash_is_unlocked &&
-	    !flash->flash_is_unlocked(flash, offset, len)) {
+	    !flash->flash_is_unlocked(flash, offset, size)) {
 		printf("ERROR: flash area is locked\n");
 		return CMD_RET_FAILURE;
 	}