diff --git a/tools/generate.go b/tools/generate.go
index 30d7291..88594bc 100644
--- a/tools/generate.go
+++ b/tools/generate.go
@@ -137,7 +137,7 @@ func parseHashFile(sourcePath string) (string, string) {
 
 func resetUrlHashFile(codehash, code, sourcePath string) string {
     payload := strings.NewReader(code)
-    resp, err := http.Post("http://play.golang.org/share", "text/plain", payload)
+    resp, err := http.Post("https://play.golang.org/share", "text/plain", payload)
     if err != nil {
         panic(err)
     }