diff --git a/devlib/utils/android.py b/devlib/utils/android.py
index 6e56c58..1a195a6 100644
--- a/devlib/utils/android.py
+++ b/devlib/utils/android.py
@@ -424,7 +424,7 @@ def _initialize_with_android_home(env):
     logger.debug('Using ANDROID_HOME from the environment.')
     env.android_home = android_home
     env.platform_tools = os.path.join(android_home, 'platform-tools')
-    os.environ['PATH'] += os.pathsep + env.platform_tools
+    os.environ['PATH'] = env.platform_tools + os.pathsep + os.environ['PATH']
     _init_common(env)
     return env