diff --git a/scripts/runtests-get-fsdiff-ref b/scripts/runtests-get-fsdiff-ref
index 7fb3833f..997151f3 100755
--- a/scripts/runtests-get-fsdiff-ref
+++ b/scripts/runtests-get-fsdiff-ref
@@ -8,7 +8,7 @@ set -e
 
 VERSION="83nightly"
 
-. $(dirname $0)/lib.sh
+. $(dirname $0)/lib.bash
 
 GITREV=$(git rev-parse HEAD)