diff --git a/oh-my-bash.sh b/oh-my-bash.sh
index 9b5dffb..83cf81a 100644
--- a/oh-my-bash.sh
+++ b/oh-my-bash.sh
@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 
 # Bail out early if non-interactive
-case $- in
-  *i*) ;;
-    *) return;;
-esac
+if [[ $- != *i* ]]; then
+  printf 'oh-my-bash: Shell is not interactive.\n' >&2
+  return 1
+fi
 
 # Check for updates on initial load...
 if [ "$DISABLE_AUTO_UPDATE" != "true" ]; then