diff --git a/tools/update-build-links b/tools/update-build-links
index 544cf66d14..76c4df3efd 100755
--- a/tools/update-build-links
+++ b/tools/update-build-links
@@ -4,9 +4,9 @@ REAL_PATH=$(python -c "import os,sys;print os.path.realpath('$0')")
 cd "$(dirname "$REAL_PATH")/.."
 
 find docker -name Dockerfile | while read dockerfile; do
-	dir=${dockerfile%/*}
-	link=$(python -c 'import os,sys; print os.path.relpath(sys.argv[1], sys.argv[2])' \
-		$PWD/tools/build-docker-image $dir)
-	ln -sf $link $dir/build
+    dir=${dockerfile%/*}
+    link=$(python -c 'import os,sys; print os.path.relpath(sys.argv[1], sys.argv[2])' \
+        $PWD/tools/build-docker-image $dir)
+    ln -sf $link $dir/build
 done