diff --git a/lib/seattleflu/id3c/cli/command/etl/__init__.py b/lib/seattleflu/id3c/cli/command/etl/__init__.py
index 8933f5a5..dab1a78d 100644
--- a/lib/seattleflu/id3c/cli/command/etl/__init__.py
+++ b/lib/seattleflu/id3c/cli/command/etl/__init__.py
@@ -196,6 +196,8 @@ def ethnicity(ethnicity: Optional[str]) -> Optional[bool]:
         "null":                               None,
         "declined to answer":                 None,
         "unable to collect":                  None,
+        "prefer not to answer":               None,
+        "don't know":                         None,
     }
 
     if ethnicity not in mapper: