diff --git a/tools/otagui/ota_interface.py b/tools/otagui/ota_interface.py
index a05a0e2c9..eba960939 100644
--- a/tools/otagui/ota_interface.py
+++ b/tools/otagui/ota_interface.py
@@ -251,7 +251,7 @@ class ProcessesManagement:
             args['extra'] = \
                 '--' + ' --'.join(args['extra_keys']) + ' ' + args['extra']
         if args['extra']:
-            command += args['extra'].split(' ')
+            command += args['extra'].strip().split(' ')
         command.append('-k')
         command.append(
             'build/make/target/product/security/testkey')