diff --git a/master.cfg b/master.cfg
index 786ae98..eea4d7e 100644
--- a/master.cfg
+++ b/master.cfg
@@ -142,7 +142,9 @@ factory.addStep(
 factory.addStep(
     steps.DirectoryUpload(
         workersrc=DOC_DIR,
-        masterdest="/buildbot_share/docs/radn-rs/%(worker:rust_version)s/",
+        masterdest=util.Interpolate(
+            "/buildbot_share/docs/radn-rs/%(worker:rust_version)s/"
+        ),
         url=util.Interpolate(
             "https://radn.parrrate.ru/latest/docs/%(worker:rust_version)s/radn_rs/"
         ),