diff --git a/lib/galaxy/tools/remote_tool_eval.py b/lib/galaxy/tools/remote_tool_eval.py
index f6984818753..8ffef968398 100644
--- a/lib/galaxy/tools/remote_tool_eval.py
+++ b/lib/galaxy/tools/remote_tool_eval.py
@@ -63,6 +63,7 @@ class ToolApp(MinimalToolApp):
         self.genome_builds = GenomeBuilds(self)
         self.tool_data_tables = tool_data_table_manager
         self.file_sources = file_sources
+        self.biotools_metadata_source = None
 
 
 def main(TMPDIR, WORKING_DIRECTORY, IMPORT_STORE_DIRECTORY):
diff --git a/test/unit/app/tools/test_tool_deserialization.py b/test/unit/app/tools/test_tool_deserialization.py
index 91ddca5ddc5..3c0577bf81d 100644
--- a/test/unit/app/tools/test_tool_deserialization.py
+++ b/test/unit/app/tools/test_tool_deserialization.py
@@ -40,6 +40,7 @@ outputs:
 
 class ToolApp(GalaxyDataTestApp):
     name = 'galaxy'
+    biotools_metadata_source = None
     job_search = None