diff --git a/hls-test-utils/src/Test/Hls.hs b/hls-test-utils/src/Test/Hls.hs
index 6b09450bd2..7e6d05e191 100644
--- a/hls-test-utils/src/Test/Hls.hs
+++ b/hls-test-utils/src/Test/Hls.hs
@@ -62,7 +62,7 @@ defaultTestRunner :: TestTree -> IO ()
 defaultTestRunner = defaultMainWithRerun . adjustOption (const $ mkTimeout 600000000)
 
 gitDiff :: FilePath -> FilePath -> [String]
-gitDiff fRef fNew = ["git", "diff", "--no-index", "--text", "--exit-code", fRef, fNew]
+gitDiff fRef fNew = ["git", "-c", "core.fileMode=false", "diff", "--no-index", "--text", "--exit-code", fRef, fNew]
 
 goldenGitDiff :: TestName -> FilePath -> IO ByteString -> TestTree
 goldenGitDiff name = goldenVsStringDiff name gitDiff