diff --git a/btrfs-image.c b/btrfs-image.c
index 3ea3730f..ab229f3f 100644
--- a/btrfs-image.c
+++ b/btrfs-image.c
@@ -2588,5 +2588,5 @@ out:
 	else
 		fclose(out);
 
-	return ret;
+	return !!ret;
 }