diff --git a/engine/src/flutter/sky/tools/run_tests b/engine/src/flutter/sky/tools/run_tests
index 5a2936febf3..709278ed2d9 100755
--- a/engine/src/flutter/sky/tools/run_tests
+++ b/engine/src/flutter/sky/tools/run_tests
@@ -24,7 +24,6 @@ def main():
     parser.add_argument('--config', default='Debug')
     parser.add_argument('--debug', dest='config', action='store_const', const='Debug')
     parser.add_argument('--release', dest='config', action='store_const', const='Release')
-    parser.add_argument('--only', help='Run only the specified test')
     args, remaining = parser.parse_known_args()
 
     build_dir = os.path.join(SRC_ROOT, 'out', args.config)
@@ -35,13 +34,6 @@ def main():
     elif sys.platform == 'darwin':
         sky_shell = os.path.join(build_dir, 'SkyShell.app', 'Contents', 'MacOS', 'SkyShell')
 
-    if args.only:
-        return subprocess.call([
-            sky_shell,
-            '--package-root=%s' % PACKAGES_DIR,
-            args.only,
-        ])
-
     env = os.environ.copy()
     env['PUB_CACHE'] = PUB_CACHE
     env['SKY_SHELL'] = sky_shell