diff --git a/tools/clone_repo.sh b/tools/clone_repo.sh
index 1c878fe..7a795b0 100755
--- a/tools/clone_repo.sh
+++ b/tools/clone_repo.sh
@@ -172,7 +172,7 @@ fi
 
 # Make sure it is up to date compared to the upstream remote.
 (cd $local_dir &&
-        git fetch origin --tags
+        git fetch origin --tags --prune
 )
 
 if [ ! -z "$REF" ]; then