diff --git a/src/pages.go b/src/pages.go
index 43f676a..5ba8b07 100644
--- a/src/pages.go
+++ b/src/pages.go
@@ -53,8 +53,10 @@ func getPage(w http.ResponseWriter, r *http.Request) error {
 		}
 	}
 
-	// allow JavaScript code to access responses (including errors) even across origins
-	w.Header().Set("Access-Control-Allow-Origin", "*")
+	if r.Header.Get("Origin") != "" {
+		// allow JavaScript code to access responses (including errors) even across origins
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+	}
 
 	if sitePath == ".git-pages" {
 		// metadata directory name shouldn't be served even if present in site manifest