diff --git a/SC2213.md b/SC2213.md
index 5b5ac69..c6d34bf 100644
--- a/SC2213.md
+++ b/SC2213.md
@@ -8,7 +8,7 @@ do
   case "$n" in
     v) echo "Verbose" ;;
     r) echo "Recursive" ;;
-    *) usage;;
+    \?) usage;;
   esac
 done
 ```
@@ -22,7 +22,7 @@ do
     v) echo "Verbose" ;;
     r) echo "Recursive" ;;
     n) echo "Dry-run" ;;    # -n handled here
-    *) usage;;
+    \?) usage;;
   esac
 done
 ```