diff --git a/Dockerfile b/Dockerfile
index 4ae1ece..2b2aae6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 ## -*- docker-image-name: "libmatch" -*-
 FROM angr/angr
 MAINTAINER edg@cs.ucsb.edu
+USER root
 RUN apt-get update && apt-get install -y sudo automake virtualenvwrapper python3-pip python3-dev python-dev build-essential libxml2-dev \
                       libxslt1-dev git libffi-dev cmake libreadline-dev libtool debootstrap debian-archive-keyring \
                       libglib2.0-dev libpixman-1-dev screen binutils-multiarch nasm vim libssl-dev 
diff --git a/bdsig/lmd.py b/bdsig/lmd.py
index f9a63b4..8cc0d6e 100644
--- a/bdsig/lmd.py
+++ b/bdsig/lmd.py
@@ -150,6 +150,8 @@ def __init__(self, project, function):
                 self.call_sites[n] = call_targets
 
     def __getattr__(self, a):
+        if a == "__getstate__" or a == "__setstate__": # to ensure correct pickling
+            raise AttributeError
         if "orig_function" in self.__dict__:
             return getattr(self.orig_function, a)
         else: