diff --git a/livekitlib b/livekitlib
index 32bd0ac..8ba8337 100644
--- a/livekitlib
+++ b/livekitlib
@@ -459,7 +459,7 @@ union_append_bundles()
 
    echo_green_star
    echo "Adding bundles to union"
-   ( ls -1 "$1" ; find modules/ 2>/dev/null ) | grep '.'$BEXT'$' | sort -n | while read BUNDLE; do
+   ( ls -1 "$1" ; find modules/ 2>/dev/null ) | grep '[.]'$BEXT'$' | sort -n | while read BUNDLE; do
       echo "* $BUNDLE"
       BUN="$(basename "$BUNDLE")"
       mkdir -p "$2/$BUN"