diff --git a/res/adamantium.xml b/res/adamantium.xml
index bb94dfc12..13d08ca99 100644
--- a/res/adamantium.xml
+++ b/res/adamantium.xml
@@ -6,6 +6,7 @@
       <construction skill="mining" minskill="8"/>
     </item>
     <resourcelimit>
+      <modifier building="mine" type="skill" value="1"/>
       <modifier type="require" building="mine"/>
     </resourcelimit>
   </resource>