diff --git a/datatypes/epc/domain/historic_epc_matching.py b/datatypes/epc/domain/historic_epc_matching.py
index 86c44b593..ce6d84f79 100644
--- a/datatypes/epc/domain/historic_epc_matching.py
+++ b/datatypes/epc/domain/historic_epc_matching.py
@@ -21,6 +21,10 @@ def _map_historic_epc_pandas_row_to_domain(row: pd.Series) -> HistoricEpc:
         for col, val in row.items()
         if col.lower() not in _EXTRA_COLS
     }
+    # pandas reads an all-integer UPRN column as float, so the cell stringifies
+    # to "151020766.0"; the domain UPRN is the bare integer string.
+    uprn = kwargs.get("uprn", "")
+    kwargs["uprn"] = uprn[:-2] if uprn.endswith(".0") else uprn
     return HistoricEpc(**kwargs)