diff --git a/pvnet/models/base_model.py b/pvnet/models/base_model.py
index e6e0e907..8665bf3c 100644
--- a/pvnet/models/base_model.py
+++ b/pvnet/models/base_model.py
@@ -735,7 +735,7 @@ def on_validation_epoch_end(self):
 
                 # make and log wand artifact
                 validation_artifact = wandb.Artifact(
-                    f"validation_results_epoch={self.current_epoch}", type="dataset"
+                    f"validation_results_epoch_{self.current_epoch}", type="dataset"
                 )
                 validation_artifact.add_file(filename)
                 wandb.log_artifact(validation_artifact)