diff --git a/rc b/rc
index 290803c..797731b 100755
--- a/rc
+++ b/rc
@@ -1,5 +1,5 @@
 # source me to enable tools
-case $OSTYPE in
+case "$OSTYPE" in
     darwin*)
       QTOOLSPATH=$( realpath $( dirname "$BASH_SOURCE" ) )
     ;;