diff --git a/src/makePatch.ts b/src/makePatch.ts
index 0afd94c4..7763c3f1 100644
--- a/src/makePatch.ts
+++ b/src/makePatch.ts
@@ -155,6 +155,7 @@ export default function makePatch(
       "--cached",
       "--no-color",
       "--ignore-space-at-eol",
+      "--no-ext-diff"
     ]).stdout.toString()
 
     if (patch.trim() === "") {