diff --git a/toolkit/components/downloads/src/Makefile.in b/toolkit/components/downloads/src/Makefile.in
index 1afae90ce0a9..1e652274df5e 100644
--- a/toolkit/components/downloads/src/Makefile.in
+++ b/toolkit/components/downloads/src/Makefile.in
@@ -74,9 +74,11 @@ CPPSRCS   = \
     nsDownloadManager.cpp \
     $(NULL)
 
+ifndef GNU_CXX
 ifeq ($(OS_ARCH),WINNT)
 CPPSRCS += nsDownloadScanner.cpp
 endif
+endif
 
 EXTRA_COMPONENTS = \
   nsDownloadManagerUI.js \
diff --git a/toolkit/components/downloads/src/nsDownloadManager.cpp b/toolkit/components/downloads/src/nsDownloadManager.cpp
index bf370b1ac0c4..67a22a03ddf5 100644
--- a/toolkit/components/downloads/src/nsDownloadManager.cpp
+++ b/toolkit/components/downloads/src/nsDownloadManager.cpp
@@ -82,8 +82,10 @@
 
 #ifdef XP_WIN
 #include <shlobj.h>
+#ifndef __MINGW32__
 #include "nsDownloadScanner.h"
 #endif
+#endif
 
 #define DOWNLOAD_MANAGER_BUNDLE "chrome://mozapps/locale/downloads/downloads.properties"
 #define DOWNLOAD_MANAGER_ALERT_ICON "chrome://mozapps/skin/downloads/downloadIcon.png"
@@ -127,7 +129,7 @@ nsDownloadManager::GetSingleton()
 
 nsDownloadManager::~nsDownloadManager()
 {
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
   delete mScanner;
 #endif
   gDownloadManagerService = nsnull;
@@ -836,7 +838,7 @@ nsDownloadManager::Init()
                                    getter_AddRefs(mBundle));
   NS_ENSURE_SUCCESS(rv, rv);
 
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
   mScanner = new nsDownloadScanner();
   if (!mScanner)
     return NS_ERROR_OUT_OF_MEMORY;
@@ -1779,7 +1781,7 @@ nsDownload::SetState(DownloadState aState)
       // Transfers are finished, so break the reference cycle
       Finalize();
       break;
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
     case nsIDownloadManager::DOWNLOAD_SCANNING:
     {
       nsresult rv = mDownloadManager->mScanner ? mDownloadManager->mScanner->ScanDownload(this) : NS_ERROR_NOT_INITIALIZED;
@@ -2083,7 +2085,7 @@ nsDownload::OnStateChange(nsIWebProgress *aWebProgress,
       mPercentComplete = 100;
       mLastUpdate = PR_Now();
 
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
       (void)SetState(nsIDownloadManager::DOWNLOAD_SCANNING);
 #else
       (void)SetState(nsIDownloadManager::DOWNLOAD_FINISHED);
diff --git a/toolkit/components/downloads/src/nsDownloadManager.h b/toolkit/components/downloads/src/nsDownloadManager.h
index a32676450ec5..01e36719cefd 100644
--- a/toolkit/components/downloads/src/nsDownloadManager.h
+++ b/toolkit/components/downloads/src/nsDownloadManager.h
@@ -71,7 +71,7 @@ typedef PRInt16 DownloadType;
 
 class nsDownload;
 
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
 class nsDownloadScanner;
 #endif
 
@@ -88,7 +88,7 @@ public:
   static nsDownloadManager *GetSingleton();
 
   virtual ~nsDownloadManager();
-#ifdef XP_WIN
+#if defined(XP_WIN) and !defined(__MINGW32__)
   nsDownloadManager() : mScanner(nsnull) { };
 private:
   nsDownloadScanner *mScanner;