diff --git a/funcext/TSOffice/worksheet/xlsxStyles.tsf b/funcext/TSOffice/worksheet/xlsxStyles.tsf
index 1191756..35e29f0 100644
--- a/funcext/TSOffice/worksheet/xlsxStyles.tsf
+++ b/funcext/TSOffice/worksheet/xlsxStyles.tsf
@@ -220,9 +220,9 @@ private
 		begin
 			if ifnil(obj.FormatCode) then xf_node.SetAttribute('numFmtId', 0);
 			else begin
-				obj.NumFmtId := 176;
+				processNumFmtId(root, 'numFmts', obj);
 				insertNode(root, 'numFmts', obj);
-				xf_node.SetAttribute('numFmtId', 176);
+				xf_node.SetAttribute('numFmtId', obj.NumFmtId);
 			end
 		end
 		else begin