diff --git a/builders/windows-builder.py b/builders/windows-builder.py
index f2edeab..bdbc3df 100644
--- a/builders/windows-builder.py
+++ b/builders/windows-builder.py
@@ -219,7 +219,7 @@ class WindowsBuilder(Builder):
             self._print('... WARNING: Windows help file not found')
         # Build the launcher.
         self._print('  Building PortableApps Launcher')
-        self_run_command([self.portablelauncher_exe, self.portable_dest_path],
+        self._run_command([self.portablelauncher_exe, self.portable_dest_path],
                          'Error creating PortableAppa Launcher')
         # Build the portable installer.
         self._print('  Building PortableApps Installer')