diff --git a/helpers/v8_build.py b/helpers/v8_build.py
index 99d09ea3..92da164f 100644
--- a/helpers/v8_build.py
+++ b/helpers/v8_build.py
@@ -11,7 +11,7 @@
 from shlex import join as shlexjoin
 from shutil import copyfile, rmtree
 from subprocess import check_call
-from sys import platform
+from sys import executable, platform
 
 basicConfig()
 LOGGER = getLogger(__name__)
@@ -89,7 +89,13 @@ def ensure_v8_src(revision):
 
     if not isfile(pathjoin(get_workspace_path(), ".gclient")):
         makedirs(get_workspace_path(), exist_ok=True)
-        run("fetch", "--nohooks", "v8", cwd=get_workspace_path())
+        run(
+            executable,
+            pathjoin(get_workspace_path(), "fetch.py"),
+            "--nohooks",
+            "v8",
+            cwd=get_workspace_path(),
+        )
 
     run("gclient", "sync", "--revision", f"v8@{revision}", cwd=get_workspace_path())