diff --git a/build.xml b/build.xml
index 2fa0d36eb..94f79060a 100644
--- a/build.xml
+++ b/build.xml
@@ -207,10 +207,12 @@
  		</copy>
 
 		<echo message="Packaging BiomesOPlenty Dev" />
-		<zip destfile="${dist.dir}/${dev.name}">
+		<jar destfile="${dist.dir}/${dev.name}" manifest="${mcp.dir}/reobf/resources/MANIFEST.MF">
 			<fileset dir="tmp" includes="**/src/**" /> 
 			<fileset dir="${mcp.dir}/bin/minecraft" includes="**/biomesoplenty/**" /> 
-		</zip>
+			<fileset dir="${mcp.dir}/reobf/resources" excludes="MANIFEST.MF">
+			</fileset>
+		</jar>
 		
 		<echo message="Renaming BiomesOPlenty Changelog" />
 		<move file="changelog.txt" tofile="${dist.dir}/${changelog.name}"/>