diff --git a/scripts/angle_deqp_test_merge.py b/scripts/angle_deqp_test_merge.py
index 2d881a4d1..e80682155 100644
--- a/scripts/angle_deqp_test_merge.py
+++ b/scripts/angle_deqp_test_merge.py
@@ -6,9 +6,14 @@
 """ Merges dEQP sharded test results in the ANGLE testing infrastucture."""
 
 import os
-import pathlib
 import sys
+if sys.version_info.major != 3 and __name__ == '__main__':
+    # Swarming prepends sys.executable so we get python2 regardless of shebang.
+    # Spawn itself with vpython3 instead.
+    import subprocess
+    sys.exit(subprocess.call(['vpython3', os.path.realpath(__file__)] + sys.argv[1:]))
 
+import pathlib  # python3
 
 PY_UTILS = str(pathlib.Path(__file__).resolve().parents[1] / 'src' / 'tests' / 'py_utils')
 if PY_UTILS not in sys.path: