diff --git a/LockOSThread.md b/LockOSThread.md
index 1c9971d..aad4e7d 100644
--- a/LockOSThread.md
+++ b/LockOSThread.md
@@ -22,7 +22,7 @@
 // Main does not return. If the binary needs to do other work, it
 // must do it in separate goroutines.
 func Main() {
-	for f = range mainfunc {
+	for f := range mainfunc {
 		f()
 	}
 }