diff --git a/build_files/buildbot/slave_compile.py b/build_files/buildbot/slave_compile.py
index d055822f69d..cc06b0ac1b2 100644
--- a/build_files/buildbot/slave_compile.py
+++ b/build_files/buildbot/slave_compile.py
@@ -65,7 +65,7 @@ if 'cmake' in builder:
             cmake_options.append('-DCMAKE_OSX_ARCHITECTURES:STRING=ppc')
 
     elif builder.startswith('win'):
-        if builder.startwith('win64'):
+        if builder.startswith('win64'):
             cmake_options.append(['-G', '"Visual Studio 12 2013 Win64"'])
         elif builder.startswith('win32'):
             cmake_options.append(['-G', '"Visual Studio 12 2013"'])