diff --git a/src/caosdb/common/datatype.py b/src/caosdb/common/datatype.py
index 3822c7497f9d2489344319edaf3c3aa64e8b2da6..03ff6d023ab0d3005c37d56c65353c1a1072518e 100644
--- a/src/caosdb/common/datatype.py
+++ b/src/caosdb/common/datatype.py
@@ -90,6 +90,7 @@ def is_reference(datatype):
     else:
         return True
 
+
 def get_referenced_recordtype(datatype):
     """Return the record type of the referenced datatype.
 
@@ -119,7 +120,8 @@ def get_referenced_recordtype(datatype):
             raise ValueError("list does not have a list datatype")
 
     if datatype == FILE:
-        raise ValueError("FILE references are not considered references with a record type")
+        raise ValueError(
+            "FILE references are not considered references with a record type")
 
     return datatype