diff --git a/source-builder/sb/build.py b/source-builder/sb/build.py
index b6c6ee9..0a51df6 100644
--- a/source-builder/sb/build.py
+++ b/source-builder/sb/build.py
@@ -167,7 +167,7 @@ class build:
                 if src['compressed-type'] != 'zip':
                     src['script'] += ' | %{__tar_extract} -'
             else:
-                src['script'] = '%{__tar_extract} %s' % (src['local'])
+                src['script'] = '%%{__tar_extract} %s' % (src['local'])
             srcs += [src]
         return srcs