diff --git a/src/main/resources/stock-grsf.xml b/src/main/resources/stock-grsf.xml
index 5850d20..ac4d0a8 100644
--- a/src/main/resources/stock-grsf.xml
+++ b/src/main/resources/stock-grsf.xml
@@ -82,7 +82,7 @@
 				</field>
 				<field>
 					<originalKey>Biomass</originalKey>
-					<modifiedKey>stock_data:Biomass</modifiedKey>
+					<modifiedKey>none:none</modifiedKey>
 				</field>
 				<field>
 					<originalKey>Fishing Pressure (FIRMS Standard)</originalKey>