diff --git a/src/main/java/net/vhati/modmanager/core/ModUtilities.java b/src/main/java/net/vhati/modmanager/core/ModUtilities.java
index c99875e..58aa18e 100644
--- a/src/main/java/net/vhati/modmanager/core/ModUtilities.java
+++ b/src/main/java/net/vhati/modmanager/core/ModUtilities.java
@@ -230,6 +230,8 @@ public class ModUtilities {
 		XMLPatcher patcher = new XMLPatcher();
 		patcher.setGlobalPanic( globalPanic );
 		Document mergedDoc = patcher.patch( mainDoc, appendDoc );
+		mainDoc = null;
+		appendDoc = null;
 
 		// Bake XML into text, filtering the stream to standardize newlines and encode.
 		// TODO: sloppyPrint() needs EOL normalizing!?