diff -r adb6b029b102 Python/frozenmain.c
--- a/Python/frozenmain.c	Wed Mar 09 15:02:31 2016 +0100
+++ b/Python/frozenmain.c	Fri Mar 11 14:55:43 2016 +0200
@@ -33,6 +33,10 @@
         }
     }
 
+    /* Isolate the execution environment */
+    Py_NoSiteFlag = 1;
+    Py_IsolatedFlag = 1;
+
     Py_FrozenFlag = 1; /* Suppress errors from getpath.c */
 
     if ((p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')
diff -r adb6b029b102 Python/sysmodule.c
--- a/Python/sysmodule.c	Wed Mar 09 15:02:31 2016 +0100
+++ b/Python/sysmodule.c	Fri Mar 11 14:55:43 2016 +0200
@@ -1915,6 +1915,10 @@
     const wchar_t *p;
     PyObject *v, *w;
 
+    if(Py_FrozenFlag) {
+        return PyList_New(0);
+    }
+    
     n = 1;
     p = path;
     while ((p = wcschr(p, delim)) != NULL) {