diff --git a/SC2010.md b/SC2010.md
index 53ee6ce..dcc5f4e 100644
--- a/SC2010.md
+++ b/SC2010.md
@@ -28,7 +28,7 @@ rm -- !(*.c)
 # POSIX
 for f in ./*
 do
-  case $f of
+  case $f in
     *.c) true;;
     *) rm "$f";;
   esac