diff --git a/tools/dev/gm.py b/tools/dev/gm.py
index 849217ec28..651dc41853 100755
--- a/tools/dev/gm.py
+++ b/tools/dev/gm.py
@@ -363,7 +363,7 @@ class Config(object):
       csa_trap = re.compile("Specify option( --csa-trap-on-node=[^ ]*)")
       match = csa_trap.search(output)
       extra_opt = match.group(1) if match else ""
-      cmdline = re.compile("python ../../tools/run.py ./mksnapshot (.*)")
+      cmdline = re.compile("python3 ../../tools/run.py ./mksnapshot (.*)")
       orig_cmdline = cmdline.search(output).group(1).strip()
       cmdline = PrepareMksnapshotCmdline(orig_cmdline, path) + extra_opt
       _Notify("V8 build requires your attention",