diff --git a/indra/llplugin/slplugin/slplugin-objc.h b/indra/llplugin/slplugin/slplugin-objc.h
index f2c2b3239c839931b817aff035171b800a0f1976..af0ebe1af2ac46d9c0d88287911407cfc4211fb2 100755
--- a/indra/llplugin/slplugin/slplugin-objc.h
+++ b/indra/llplugin/slplugin/slplugin-objc.h
@@ -29,7 +29,9 @@
  */
 
 //Protos for ObjectiveC classes (cannot import cocoa here due to BOOL conflict)
+#ifndef __OBJC__
 class NSWindow;
+#endif // __OBJC__
 
 /* Defined in slplugin-objc.mm: */