diff --git a/trb.sh b/trb.sh
index 0c542f0..497966a 100755
--- a/trb.sh
+++ b/trb.sh
@@ -21,7 +21,7 @@ if [[ $? == 1 ]];then
     exit
 else
     
-    results=$($su_prompt "/sbin/fstrim -va")
+    results=$(${su_prompt} /sbin/fstrim -va)
     notify-send "${results}"
     echo "${results}"