diff --git a/src/main/java/net/runelite/deob/ClassGroup.java b/src/main/java/net/runelite/deob/ClassGroup.java
index 80393565d7..a252a8a16e 100644
--- a/src/main/java/net/runelite/deob/ClassGroup.java
+++ b/src/main/java/net/runelite/deob/ClassGroup.java
@@ -44,6 +44,12 @@ public class ClassGroup
 				return c;
 		return null;
 	}
+	
+	public void initialize()
+	{
+		buildClassGraph();
+		lookup();
+	}
 
 	public void buildClassGraph()
 	{
diff --git a/src/main/java/net/runelite/deob/util/JarUtil.java b/src/main/java/net/runelite/deob/util/JarUtil.java
index ecdfeab8a9..bd97fd6ae9 100644
--- a/src/main/java/net/runelite/deob/util/JarUtil.java
+++ b/src/main/java/net/runelite/deob/util/JarUtil.java
@@ -35,6 +35,8 @@ public class JarUtil
 			}
 		}
 		
+		group.initialize();
+		
 		return group;
 	}