diff --git a/run.sh b/run.sh
index 388bfa7..8147ab3 100755
--- a/run.sh
+++ b/run.sh
@@ -64,15 +64,8 @@ main () {
 }
 
 sourced () {
-  if [ -n "$ZSH_VERSION" ]
-  then
-    case $ZSH_EVAL_CONTEXT in
-      *:file*) return 0;;
-    esac
-  elif [ -n "$BASH_VERSION" ]
-  then
-    ! [ "$0" = "$BASH_SOURCE" ] && return 0
-  fi
+  [ -n "$ZSH_VERSION"  ] && [[ "$ZSH_EVAL_CONTEXT" =~ :file ]] && return 0
+  [ -n "$BASH_VERSION" ] && ! [ "$0" = "$BASH_SOURCE" ] && return 0
   return 1
 }