diff --git a/themes/rana/rana.theme.bash b/themes/rana/rana.theme.bash
old mode 100644
new mode 100755
index 25530397..3da74d6d
--- a/themes/rana/rana.theme.bash
+++ b/themes/rana/rana.theme.bash
@@ -181,7 +181,7 @@ prompt() {
   local MOVE_CURSOR_RIGHTMOST='\033[500C'
   local MOVE_CURSOR_5_LEFT='\033[5D'
 
-  if [ $(uname) = "Linux" ];
+  if [[ "$OSTYPE" == 'linux'* ]];
   then
     PS1="${TITLEBAR}
 ${SAVE_CURSOR}${MOVE_CURSOR_RIGHTMOST}${MOVE_CURSOR_5_LEFT}\