--- a/testing/mozbase/mozrunner/mozrunner/devices/android_device.py
+++ b/testing/mozbase/mozrunner/mozrunner/devices/android_device.py
@@ -577,16 +577,21 @@ def _find_sdk_exe(substs, exe, tools):
             if os.path.exists(exe_path):
                 found = True
             else:
                 _log_debug(
                     "Unable to find executable at %s" % exe_path)
         except KeyError:
             _log_debug("%s not set" % exe.upper())
 
+    # Append '.exe' to the name on Windows if it's not present,
+    # so that the executable can be found.
+    if (os.name == 'nt' and not exe.lower().endswith('.exe')):
+        exe += '.exe'
+
     if not found:
         # Can exe be found in the Android SDK?
         try:
             android_sdk_root = os.environ['ANDROID_SDK_ROOT']
             exe_path = os.path.join(
                 android_sdk_root, subdir, exe)
             if os.path.exists(exe_path):
                 found = True