diff --git a/build.xml b/build.xml
index ddef19b3b..44671adab 100644
--- a/build.xml
+++ b/build.xml
@@ -4,7 +4,7 @@
 
 	<property name="mod.version" value="0.6.3" />
 	<condition property="mod.build" value="${env.BUILD_NUMBER}" else="0">
-		<isset property="env.BUILD_NUMBER" />
+		<isset property="env.DRONE_BUILD_NUMBER" />
 	</condition>
 	<property name="mc.version" value="1.6.2" />
 	<property name="forge.version" value="9.10.1.857" />