diff --git a/qcd_function b/qcd_function
index d089f84..76b0090 100644
--- a/qcd_function
+++ b/qcd_function
@@ -1,12 +1,10 @@
 
 ## improved CD commands:
 _QCD_FIND=find
-case $OSTYPE in
-    darwin*)
-        alias tac=gtac
-        _QCD_FIND=gfind
-     ;;
-esac
+if [[ "$OSTYPE" = "darwin"* ]]; then
+  alias tac=gtac
+  _QCD_FIND=gfind
+fi
 
 function gcd() {
     # guess cd,  find first match in folder, or ask if multiple hits