diff --git a/ground/oil_sea.arc b/ground/oil_sea.arc
index 6bbd54f3f..bdb1604ea 100644
--- a/ground/oil_sea.arc
+++ b/ground/oil_sea.arc
@@ -8,6 +8,8 @@ oil_sea.114
 oil_sea.113
 oil_sea.112
 mina
+name oil
+name_pl oil
 magicmap blue
 smoothlevel 16
 smoothface oil_sea.111 oil_sea_S.111