diff --git a/_service b/_service
index ea31f96..d5d955d 100644
--- a/_service
+++ b/_service
@@ -2,6 +2,7 @@
   <service name="tar_scm" mode="disabled">
     <param name="url">https://github.com/openSUSE/polkit-default-privs.git</param>
     <param name="scm">git</param>
+    <param name="revision">master</param>
     <param name="versionformat">13.2+%cd.%h</param>
     <param name="changesgenerate">enable</param>
   </service>
diff --git a/polkit-default-privs.changes b/polkit-default-privs.changes
index d8c8a86..dc75a26 100644
--- a/polkit-default-privs.changes
+++ b/polkit-default-privs.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Jan 25 21:32:41 UTC 2019 - bjorn.lie@gmail.com
+
+- Be explicit in service file about master branch is the one in use
+  for tarball generation via revision parameter.
+
 -------------------------------------------------------------------
 Mon Jan 14 15:56:23 UTC 2019 - matthias.gerstner@suse.com