Updated link to shim 15.1 build patch to be based on the v4 shim-build tag
diff --git a/README.md b/README.md
index 1067196..7e0ae03 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@
 What patches are being applied and why:
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 A patch for a missing '{' in mok.c is applied to the shim-15.1 code base, as the build fails without it:
-https://github.com/neverware/shim-build/blob/master/build-fix.patch
+https://github.com/neverware/shim-build/blob/v4/build-fix.patch
 
 
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