diff --git a/indra/newview/llviewerprecompiledheaders.h b/indra/newview/llviewerprecompiledheaders.h
index 6039d5ec3..466c69b28 100644
--- a/indra/newview/llviewerprecompiledheaders.h
+++ b/indra/newview/llviewerprecompiledheaders.h
@@ -41,6 +41,17 @@
 
 #include "linden_common.h"
 
+// We may want to take the windows.h include out, but it used to be in 
+// linden_common.h, and hence in all the libraries.  This is better. JC
+#if LL_WINDOWS
+	// Limit Windows API to small and manageable set.
+	// If you get undefined symbols, find the appropriate
+	// Windows header file and include that in your .cpp file.
+#define WIN32_LEAN_AND_MEAN
+#include <winsock2.h>
+#include <windows.h>
+#endif
+
 #include <algorithm>
 #include <deque>
 #include <functional>