diff --git a/kg_microbe_merge/merge.py b/kg_microbe_merge/merge.py
index 7ad2dea..3610ead 100644
--- a/kg_microbe_merge/merge.py
+++ b/kg_microbe_merge/merge.py
@@ -60,14 +60,13 @@ def duckdb_merge(
         Path(file_path) for file_path in nodes_files_path if "ontologies" in str(file_path)
     ]
     for file_path in ontology_nodes_paths:
-        if file_path.suffix == ".tsv":
-            with file_path.open(newline="") as tsvfile:
-                reader = csv.DictReader(tsvfile, delimiter="\t")
-                for row in reader:
-                    provided_by_value = row.get("provided_by")
-                    if provided_by_value:
-                        priority_sources.append(provided_by_value)
-                        break  # We only need the value from one row
+        with file_path.open(newline="") as tsvfile:
+            reader = csv.DictReader(tsvfile, delimiter="\t")
+            for row in reader:
+                provided_by_value = row.get("provided_by")
+                if provided_by_value:
+                    priority_sources.append(provided_by_value)
+                    break  # We only need the value from one row
 
     # Merge nodes
     duckdb_nodes_merge(nodes_files_path, merge_nodes_output_path, priority_sources)