diff --git a/src/sum.sh b/src/sum.sh
index aad2702..1089c53 100644
--- a/src/sum.sh
+++ b/src/sum.sh
@@ -1,9 +1,8 @@
 # /etc/profile.d/sum.sh
 
-# Ensure the script is sourced, not executed
-if [[ "$0" == "${BASH_SOURCE[0]}" ]] || [[ "$0" == "${(%):-%x}" ]]; then
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
   echo "This script should be sourced, not executed."
-  return 1 2>/dev/null || exit 1
+  exit 1
 fi
 
 # Function to generate SHA-256 hashes for .sh files in a given directory
diff --git a/src/sum.sh.sha256 b/src/sum.sh.sha256
index 9af9f6b..3b57738 100644
--- a/src/sum.sh.sha256
+++ b/src/sum.sh.sha256
@@ -1 +1 @@
-4f1ce7aae33e2ecbaf27cb28ab7fad332f4f65e814d79fdda70e07f118f2d808
+7846925456f82da2e475833061a4ee605302d3db001d0df8c1678d71e9329896