diff --git a/build/rust/write_cargo_toml.py b/build/rust/write_cargo_toml.py
index e38c77e..12f7ecb 100755
--- a/build/rust/write_cargo_toml.py
+++ b/build/rust/write_cargo_toml.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python3
 # Copyright 2018 The Fuchsia Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -57,10 +57,10 @@
 # or `None` on failure.
 def add_dep(args, third_party_json, data_path):
     if not os.path.isfile(data_path):
-        print TERM_COLOR_RED
-        print "Missing Rust target data for dependency " + data_path
-        print "Did you accidentally depend on a non-Rust target?"
-        print TERM_COLOR_END
+        print(TERM_COLOR_RED)
+        print("Missing Rust target data for dependency " + data_path)
+        print("Did you accidentally depend on a non-Rust target?")
+        print(TERM_COLOR_END)
         return None
     dep_data = json.load(open(data_path))
     if dep_data["third_party"]: