diff --git a/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/mlmodel/mappers/MLExperimentSnapshotMapper.java b/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/mlmodel/mappers/MLExperimentSnapshotMapper.java
index 0634679c97258..4e13a6d52b684 100644
--- a/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/mlmodel/mappers/MLExperimentSnapshotMapper.java
+++ b/datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/types/mlmodel/mappers/MLExperimentSnapshotMapper.java
@@ -73,7 +73,7 @@ public MLExperiment apply(@Nonnull final MLExperimentSnapshot mlExperiment) {
                     result.setDescription(experimentProperties.getDescription());
                 }
                 if (experimentProperties.hasExternalUrl()) {
-                    result.setExternalUrl(experimentProperties.getExternalUrl());
+                    result.setExternalUrl(experimentProperties.getExternalUrl().toString());
                 }
             } else if (aspect instanceof GlobalTags) {
                 result.setGlobalTags(GlobalTagsMapper.map((GlobalTags) aspect));