diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index a7ad331c99..9fca49ad17 100755
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -192,7 +192,7 @@ module SyncDefaultGems
     when "json"
       rm_rf(%w[ext/json test/json])
       cp_r("#{upstream}/ext/json/ext", "ext/json")
-      cp_r("#{upstream}/tests", "test/json")
+      cp_r("#{upstream}/test/json", "test/json")
       rm_rf("test/json/lib")
       cp_r("#{upstream}/lib", "ext/json")
       cp_r("#{upstream}/json.gemspec", "ext/json")