diff --git a/tools_webrtc/android/build_aar.py b/tools_webrtc/android/build_aar.py
index 047be7b0a2..9fc4bb0f39 100755
--- a/tools_webrtc/android/build_aar.py
+++ b/tools_webrtc/android/build_aar.py
@@ -54,9 +54,11 @@ def _ParseArgs():
     parser = argparse.ArgumentParser(description='libwebrtc.aar generator.')
     parser.add_argument(
         '--build-dir',
+        type=os.path.abspath,
         help='Build dir. By default will create and use temporary dir.')
     parser.add_argument('--output',
                         default='libwebrtc.aar',
+                        type=os.path.abspath,
                         help='Output file of the script.')
     parser.add_argument(
         '--arch',
diff --git a/tools_webrtc/ios/build_ios_libs.py b/tools_webrtc/ios/build_ios_libs.py
index 65ad6d3f5e..3be0eb1975 100755
--- a/tools_webrtc/ios/build_ios_libs.py
+++ b/tools_webrtc/ios/build_ios_libs.py
@@ -67,6 +67,7 @@ def _ParseArgs():
     parser.add_argument(
         '-o',
         '--output-dir',
+        type=os.path.abspath,
         default=SDK_OUTPUT_DIR,
         help='Specifies a directory to output the build artifacts to. '
         'If specified together with -c, deletes the dir.')