diff --git a/songbook b/songbook
index bba8cbdf..e16b8d1a 100755
--- a/songbook
+++ b/songbook
@@ -3,8 +3,8 @@
 # Do not edit this file. This file is just a helper file for development test.
 # It is not part of the distributed software.
 
-if [ $1 = "purgecache" ]; then
+if [ "$1" = "purgecache" ]; then
     find . -name ".cache" -type d -print -exec rm -r {} +
 else
-    python -m patacrep.songbook $*
+    python -m patacrep.songbook "$@"
 fi