diff --git a/master.cfg b/master.cfg
index 16011be..db3ee8c 100644
--- a/master.cfg
+++ b/master.cfg
@@ -145,7 +145,7 @@ factory.addStep(
         workersrc=DOC_DIR,
         masterdest="/buildbot_share/docs/radn-rs/",
         url=util.Interpolate(
-            "https://radn.parrrate.ru/latest/%(worker:rust_version)/docs/radn_rs/"
+            "https://radn.parrrate.ru/latest/%(worker:rust_version)s/docs/radn_rs/"
         ),
     )
 )