diff --git a/src/cgr_gwas_qc/reporting/sample_qc.py b/src/cgr_gwas_qc/reporting/sample_qc.py
index f3fcff27..a777a2cb 100644
--- a/src/cgr_gwas_qc/reporting/sample_qc.py
+++ b/src/cgr_gwas_qc/reporting/sample_qc.py
@@ -217,7 +217,6 @@ def _build_table(sample_qc: pd.DataFrame) -> str:
         # Issue 281: Ensure 'Other' ancestry output from graf-pop captured in table 3
 
         # Add 'Other' to the categories and full blanks with "Other"
-        sample_qc["Ancestry"] = sample_qc["Ancestry"].cat.add_categories(["Other"])
         sample_qc["Ancestry"] = sample_qc["Ancestry"].fillna("Other")
 
         return (