diff --git a/module_build_service/builder/KojiContentGenerator.py b/module_build_service/builder/KojiContentGenerator.py
index 2f277881..27142e61 100644
--- a/module_build_service/builder/KojiContentGenerator.py
+++ b/module_build_service/builder/KojiContentGenerator.py
@@ -710,7 +710,7 @@ class KojiContentGenerator(object):
         # Fill in the list of built RPMs.
         mmd = self._fill_in_rpms_list(mmd, arch)
 
-        return text_type(mmd.dumps(), "utf-8")
+        return text_type(mmd.dumps())
 
     def _download_source_modulemd(self, mmd, output_path):
         """