diff --git a/pungi/phases/pkgset/sources/source_kojimock.py b/pungi/phases/pkgset/sources/source_kojimock.py
index 6391ad4f..a9558672 100644
--- a/pungi/phases/pkgset/sources/source_kojimock.py
+++ b/pungi/phases/pkgset/sources/source_kojimock.py
@@ -753,8 +753,9 @@ def _get_modules_from_koji_tags(
         # There are some module names that were listed in configuration and not
         # found in any tag...
         raise RuntimeError(
-            "Configuration specified patterns (%s) that don't match "
-            "any modules in the configured tags." % ", ".join(expected_modules)
+            f"Configuration specified patterns ({', '.join(expected_modules)})"
+            " that don't match any modules in "
+            f"the configured tags for variant '{variant.name}'"
         )