diff --git a/conservancy_beancount/reports/core.py b/conservancy_beancount/reports/core.py
index 985c85f457160c79b0f51a045dea1c4b03189ae5..45e5040232418f830ddd355103458a06a29d0d18 100644
--- a/conservancy_beancount/reports/core.py
+++ b/conservancy_beancount/reports/core.py
@@ -752,9 +752,6 @@ class BaseODS(BaseSpreadsheet[RT, ST], metaclass=abc.ABCMeta):
             fmt = fmts[fmt_index]
         except IndexError:
             fmt = fmts[0]
-            grouping = pattern.grouping[0]
-        else:
-            grouping = pattern.grouping[fmt_index]
         style = self.replace_child(
             root,
             odf.number.CurrencyStyle,
@@ -769,7 +766,7 @@ class BaseODS(BaseSpreadsheet[RT, ST], metaclass=abc.ABCMeta):
             elif not part.strip('#0,.'):
                 style.addElement(odf.number.Number(
                     decimalplaces=str(pattern.frac_prec[0]),
-                    grouping='true' if grouping else 'false',
+                    grouping='true' if pattern.grouping[0] else 'false',
                     minintegerdigits=str(minintegerdigits),
                 ))
             elif part == '¤':