diff --git a/pungi/wrappers/scm.py b/pungi/wrappers/scm.py
index 740cee6b..1745107a 100644
--- a/pungi/wrappers/scm.py
+++ b/pungi/wrappers/scm.py
@@ -44,7 +44,13 @@ class ScmBase(kobo.log.LoggingBase):
     def run_process_command(self, cwd):
         if self.command:
             self.log_debug('Running "%s"' % self.command)
-            retcode, output = run(self.command, workdir=cwd, can_fail=True)
+            retcode, output = run(
+                self.command,
+                workdir=cwd,
+                can_fail=True,
+                stdin_data="",
+                universal_newlines=True,
+            )
             if retcode != 0:
                 self.log_error('Output was: %r' % output)
                 raise RuntimeError('%r failed with exit code %s'