--- a/testing/mozharness/configs/builds/releng_base_windows_32_builds.py
+++ b/testing/mozharness/configs/builds/releng_base_windows_32_builds.py
@@ -26,17 +26,17 @@ config = {
         'python2.7': sys.executable,
         'hgtool.py': [
             sys.executable,
             os.path.join(
                 os.getcwd(), 'build', 'tools', 'buildfarm', 'utils', 'hgtool.py'
             )
         ],
         "buildbot": [
-            sys.executable,
+            'C:\\mozilla-build\\buildbotve\\Scripts\\python.exe',
             'c:\\mozilla-build\\buildbotve\\scripts\\buildbot'
         ],
         "make": [
             sys.executable,
             os.path.join(
                 os.getcwd(), 'build', 'src', 'build', 'pymake', 'make.py'
             )
         ],

--- a/testing/mozharness/configs/builds/releng_base_windows_64_builds.py
+++ b/testing/mozharness/configs/builds/releng_base_windows_64_builds.py
@@ -26,17 +26,17 @@ config = {
         'python2.7': sys.executable,
         'hgtool.py': [
             sys.executable,
             os.path.join(
                 os.getcwd(), 'build', 'tools', 'buildfarm', 'utils', 'hgtool.py'
             )
         ],
         "buildbot": [
-            sys.executable,
+            'C:\\mozilla-build\\buildbotve\\Scripts\\python.exe',
             'c:\\mozilla-build\\buildbotve\\scripts\\buildbot'
         ],
         "make": [
             sys.executable,
             os.path.join(
                 os.getcwd(), 'build', 'src', 'build', 'pymake', 'make.py'
             )
         ],