diff --git a/src/gallium/targets/libgl-gdi/SConscript b/src/gallium/targets/libgl-gdi/SConscript
index 57704440ce7..21b4eb2abee 100644
--- a/src/gallium/targets/libgl-gdi/SConscript
+++ b/src/gallium/targets/libgl-gdi/SConscript
@@ -9,6 +9,7 @@ if env['platform'] == 'windows':
 
     env.Append(CPPPATH = [
         '#src/gallium/state_trackers/wgl',
+        '#src/gallium/winsys/sw',
     ])
 
     env.Append(LIBS = [