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diff --git a/lib/python2.7/lib2to3/fixes/fix_exec.py b/lib/python2.7/lib2to3/fixes/fix_exec.py
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+++ b/lib/python2.7/lib2to3/fixes/fix_exec.py
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+# Copyright 2006 Google, Inc. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer for exec.
+
+This converts usages of the exec statement into calls to a built-in
+exec() function.
+
+exec code in ns1, ns2 -> exec(code, ns1, ns2)
+"""
+
+# Local imports
+from .. import pytree
+from .. import fixer_base
+from ..fixer_util import Comma, Name, Call
+
+
+class FixExec(fixer_base.BaseFix):
+    BM_compatible = True
+
+    PATTERN = """
+    exec_stmt< 'exec' a=any 'in' b=any [',' c=any] >
+    |
+    exec_stmt< 'exec' (not atom<'(' [any] ')'>) a=any >
+    """
+
+    def transform(self, node, results):
+        assert results
+        syms = self.syms
+        a = results["a"]
+        b = results.get("b")
+        c = results.get("c")
+        args = [a.clone()]
+        args[0].prefix = ""
+        if b is not None:
+            args.extend([Comma(), b.clone()])
+        if c is not None:
+            args.extend([Comma(), c.clone()])
+
+        return Call(Name(u"exec"), args, prefix=node.prefix)