diff --git a/invokeai/app/services/model_install/model_install_common.py b/invokeai/app/services/model_install/model_install_common.py
index 2de1db5474..d42e7632f3 100644
--- a/invokeai/app/services/model_install/model_install_common.py
+++ b/invokeai/app/services/model_install/model_install_common.py
@@ -106,8 +106,10 @@ class HFModelSource(StringLikeSource):
     def __str__(self) -> str:
         """Return string version of repoid when string rep needed."""
         base: str = self.repo_id
-        base += f":{self.variant or ''}"
-        base += f":{self.subfolder}" if self.subfolder else ""
+        if self.variant:
+            base += f":{self.variant or ''}"
+        if self.subfolder:
+            base += f":{self.subfolder}"
         return base