diff --git a/mozilla/network/module/nsLoadAttribs.cpp b/mozilla/network/module/nsLoadAttribs.cpp
index 30bfcfa5f76..22d94cf948d 100644
--- a/mozilla/network/module/nsLoadAttribs.cpp
+++ b/mozilla/network/module/nsLoadAttribs.cpp
@@ -21,6 +21,10 @@
 #include "nsILoadAttribs.h"
 #include "prtypes.h"
 
+#if defined(XP_PC)
+#include <windows.h>  // Needed for Interlocked APIs defined in nsISupports.h
+#endif /* XP_PC */
+
 
 // nsLoadAttribs definition.
 class nsLoadAttribs : public nsILoadAttribs {
diff --git a/mozilla/network/module/nsNetStream.cpp b/mozilla/network/module/nsNetStream.cpp
index a1de016975b..56d08dbae21 100644
--- a/mozilla/network/module/nsNetStream.cpp
+++ b/mozilla/network/module/nsNetStream.cpp
@@ -20,6 +20,9 @@
 #include "net.h"
 #include "mktrace.h"
 
+#if defined(XP_PC)
+#include <windows.h>  // Needed for Interlocked APIs defined in nsISupports.h
+#endif /* XP_PC */
 
 /* XXX: Declare NET_PollSockets(...) for the blocking stream hack... */
 extern "C" {
diff --git a/mozilla/network/module/nsURL.cpp b/mozilla/network/module/nsURL.cpp
index 0513f844be0..a89fefbd376 100644
--- a/mozilla/network/module/nsURL.cpp
+++ b/mozilla/network/module/nsURL.cpp
@@ -28,9 +28,14 @@
 #include "plstr.h"
 #include "prprf.h"  /* PR_snprintf(...) */
 #include "prmem.h"  /* PR_Malloc(...) / PR_Free(...) */
-#ifdef XP_MAC
+#if defined(XP_MAC)
 #include "xp_mcom.h"	/* XP_STRDUP() */
-#endif
+#endif  /* XP_MAC */
+
+#if defined(XP_PC)
+#include <windows.h>  // Needed for Interlocked APIs defined in nsISupports.h
+#endif /* XP_PC */
+
 
 class URLImpl : public nsIURL {
 public: