diff --git a/jenkins.sh b/jenkins.sh
index 494aeeb399..2fd3048ff9 100755
--- a/jenkins.sh
+++ b/jenkins.sh
@@ -6,5 +6,5 @@ npm install
 (cd node_modules/matrix-react-sdk && npm run build) # npm doesn't do this when dependencies point at github.com >:(
 npm run build # Dumps artificats to /vector
 rm vector-*.tar.gz || true # rm previous artifacts without failing if it doesn't exist
-REACT_SHA=$(cd node_modules/matrix-react-sdk && git rev-parse --short=12 HEAD) # use the ACTUAL SHA rather than assume develop
+REACT_SHA=$(git --git-dir node_modules/matrix-react-sdk/.git rev-parse --short=12 HEAD) # use the ACTUAL SHA rather than assume develop
 tar -zcvhf vector-$GIT_COMMIT-react-$REACT_SHA.tar.gz vector #g[z]ip, [c]reate archive, [v]erbose, [f]ilename, [h]ard-dereference (do not archive symlinks)