diff --git a/LauncherAuthlib/MANIFEST.MF b/LauncherAuthlib/MANIFEST.MF
index 2e661e7..2263df0 100644
--- a/LauncherAuthlib/MANIFEST.MF
+++ b/LauncherAuthlib/MANIFEST.MF
@@ -1,7 +1,7 @@
 Manifest-Version: 1.0
 
-Name: com/mojang/authlib
+Name: com/mojang/authlib/
 Sealed: true
 
-Name: com/mojang/util
+Name: com/mojang/util/
 Sealed: true
diff --git a/build.sh b/build.sh
index 42f3162..bdd1445 100755
--- a/build.sh
+++ b/build.sh
@@ -6,18 +6,18 @@
 
 # Build Launcher.jar
 echo 'Packing Launcher.jar binary'
-pack200 -O -E9 -Htrue -mlatest -Ustrip -r Launcher.jar
+pack200 -E9 -Htrue -mlatest -Uerror -r Launcher.jar
 jarsigner -keystore build/sashok724.jks -storepass PSP1004 -sigfile LAUNCHER Launcher.jar sashok724 > /dev/null
 pack200 Launcher.pack.gz Launcher.jar
 
 # Build LauncherAuthlib.jar
 echo 'Packing LauncherAuthlib.jar binary'
-pack200 -O -E9 -Htrue -mlatest -Ustrip -r LauncherAuthlib.jar
+pack200 -E9 -Htrue -mlatest -Uerror -r LauncherAuthlib.jar
 jarsigner -keystore build/sashok724.jks -storepass PSP1004 -sigfile LAUNCHER LauncherAuthlib.jar sashok724 > /dev/null
 
 # Build LaunchServer.jar
 echo 'Packing LaunchServer.jar binary'
 zip -9 LaunchServer.jar Launcher.pack.gz
-pack200 -O -E9 -Htrue -mlatest -Ustrip -r LaunchServer.jar
+pack200 -E9 -Htrue -mlatest -Uerror -r LaunchServer.jar
 jarsigner -keystore build/sashok724.jks -storepass PSP1004 -sigfile LAUNCHER LaunchServer.jar sashok724 > /dev/null
 rm Launcher.pack.gz
diff --git a/compat/LaunchWrapper.patch b/compat/LaunchWrapper.patch
new file mode 100644
index 0000000..4bf116b
--- /dev/null
+++ b/compat/LaunchWrapper.patch
@@ -0,0 +1,17 @@
+diff --git a/src/main/java/net/minecraft/launchwrapper/LaunchClassLoader.java b/src/main/java/net/minecraft/launchwrapper/LaunchClassLoader.java
+index f4e83af..d3a6d7f 100644
+--- a/src/main/java/net/minecraft/launchwrapper/LaunchClassLoader.java
++++ b/src/main/java/net/minecraft/launchwrapper/LaunchClassLoader.java
+@@ -58,6 +58,12 @@ public class LaunchClassLoader extends URLClassLoader {
+         addClassLoaderExclusion("org.apache.logging.");
+         addClassLoaderExclusion("net.minecraft.launchwrapper.");
+ 
++        // classloader launcher exclusions
++        addClassLoaderExclusion("launcher.");
++        addClassLoaderExclusion("com.mojang.");
++        addClassLoaderExclusion("com.google.gson.");
++        addClassLoaderExclusion("org.json.");
++
+         // transformer exclusions
+         addTransformerExclusion("javax.");
+         addTransformerExclusion("argo.");