diff --git a/build/image/convert_to_binary.py b/build/image/convert_to_binary.py
index 482b70e..978d359 100644
--- a/build/image/convert_to_binary.py
+++ b/build/image/convert_to_binary.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright 2018 The Hafnium Authors.
 #
@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-#!/usr/bin/env python
 """Convert a file to binary format.
 
 Calls objcopy to convert a file into raw binary format.