diff --git a/modules/plugin/base/src/Makefile.in b/modules/plugin/base/src/Makefile.in
index bbc5b595f4e..87bcef02f92 100644
--- a/modules/plugin/base/src/Makefile.in
+++ b/modules/plugin/base/src/Makefile.in
@@ -89,7 +89,6 @@ CPPSRCS		= \
 		nsPluginHostImpl.cpp \
 		nsPluginModule.cpp \
 		nsPluginInstancePeer.cpp \
-		nsPluginDirServiceProvider.cpp \
 		nsJSNPRuntime.cpp \
 		$(NULL)
 
@@ -100,6 +99,7 @@ else
 ifneq (,$(filter WINNT WINCE,$(OS_ARCH)))
 	CPPSRCS += nsPluginsDirWin.cpp
 	CPPSRCS += nsPluginNativeWindowWin.cpp
+	CPPSRCS += nsPluginDirServiceProvider.cpp
 else
 ifeq ($(MOZ_WIDGET_TOOLKIT),os2)
 	CPPSRCS += nsPluginsDirOS2.cpp
diff --git a/modules/plugin/base/src/nsPluginDirServiceProvider.cpp b/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
index 05c703de884..9cfec0ac2d0 100644
--- a/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
+++ b/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
@@ -48,8 +48,6 @@
 #include "prmem.h"
 #include "nsArrayEnumerator.h"
 
-#if defined (XP_WIN)
-
 typedef struct structVer
 {
   WORD wMajor;
@@ -193,7 +191,6 @@ CompareVersion(verBlock vbVersionOld, verBlock vbVersionNew)
   /* the versions are all the same */
   return 0;
 }
-#endif
 
 //*****************************************************************************
 // nsPluginDirServiceProvider::Constructor/Destructor
@@ -229,7 +226,6 @@ nsPluginDirServiceProvider::GetFile(const char *prop, PRBool *persistant,
   *_retval = nsnull;
   *persistant = PR_TRUE;
 
-#if defined(XP_WIN)
   nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
   if (!prefs) {
     return rv;
@@ -544,7 +540,6 @@ nsPluginDirServiceProvider::GetFile(const char *prop, PRBool *persistant,
     }
 
   }
-#endif
 
   if (localFile && NS_SUCCEEDED(rv))
     return CallQueryInterface(localFile, _retval);
@@ -552,7 +547,6 @@ nsPluginDirServiceProvider::GetFile(const char *prop, PRBool *persistant,
   return rv;
 }
 
-#ifdef XP_WIN
 nsresult
 nsPluginDirServiceProvider::GetPLIDDirectories(nsISimpleEnumerator **aEnumerator)
 {
@@ -635,5 +629,3 @@ nsPluginDirServiceProvider::GetPLIDDirectoriesWithHKEY(HKEY aKey, nsCOMArray<nsI
   return NS_OK;
 }
 
-#endif
-
diff --git a/modules/plugin/base/src/nsPluginHostImpl.cpp b/modules/plugin/base/src/nsPluginHostImpl.cpp
index c51883b3fa0..74be19be869 100644
--- a/modules/plugin/base/src/nsPluginHostImpl.cpp
+++ b/modules/plugin/base/src/nsPluginHostImpl.cpp
@@ -3311,6 +3311,7 @@ NS_IMETHODIMP nsPluginHostImpl::Destroy(void)
     NS_RELEASE(sPluginTempDir);
   }
 
+#ifdef XP_WIN
   if (mPrivateDirServiceProvider)
   {
     nsCOMPtr<nsIDirectoryService> dirService =
@@ -3319,6 +3320,7 @@ NS_IMETHODIMP nsPluginHostImpl::Destroy(void)
       dirService->UnregisterProvider(mPrivateDirServiceProvider);
     mPrivateDirServiceProvider = nsnull;
   }
+#endif /* XP_WIN */
 
   nsCOMPtr<nsIPrefBranch2> prefBranch(do_QueryInterface(mPrefService));
   if (prefBranch) {
@@ -5297,9 +5299,11 @@ nsresult nsPluginHostImpl::FindPlugins(PRBool aCreatePluginList, PRBool * aPlugi
   if (compManager)
     LoadXPCOMPlugins(compManager);
 
+#ifdef XP_WIN
   // Failure here is not a show-stopper so just warn.
   rv = EnsurePrivateDirServiceProvider();
   NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to register dir service provider.");
+#endif /* XP_WIN */
 
   nsCOMPtr<nsIProperties> dirService(do_GetService(kDirectoryServiceContractID, &rv));
   if (NS_FAILED(rv))
@@ -5331,8 +5335,7 @@ nsresult nsPluginHostImpl::FindPlugins(PRBool aCreatePluginList, PRBool * aPlugi
   mPluginsLoaded = PR_TRUE; // at this point 'some' plugins have been loaded,
                             // the rest is optional
 
-#if defined (XP_WIN)
-
+#ifdef XP_WIN
   PRBool bScanPLIDs = PR_FALSE;
 
   if (mPrefService)
@@ -5403,7 +5406,6 @@ nsresult nsPluginHostImpl::FindPlugins(PRBool aCreatePluginList, PRBool * aPlugi
       }
     }
   }
-
 #endif
 
   // if get to this point and did not detect changes in plugins
@@ -5832,6 +5834,7 @@ nsPluginHostImpl::RemoveCachedPluginsInfo(const char *filename, nsPluginTag **re
   }
 }
 
+#ifdef XP_WIN
 nsresult
 nsPluginHostImpl::EnsurePrivateDirServiceProvider()
 {
@@ -5850,6 +5853,7 @@ nsPluginHostImpl::EnsurePrivateDirServiceProvider()
   }
   return NS_OK;
 }
+#endif /* XP_WIN */
 
 ////////////////////////////////////////////////////////////////////////
 /* Called by GetURL and PostURL */
diff --git a/modules/plugin/base/src/nsPluginHostImpl.h b/modules/plugin/base/src/nsPluginHostImpl.h
index 5ef2c110580..290cef58435 100644
--- a/modules/plugin/base/src/nsPluginHostImpl.h
+++ b/modules/plugin/base/src/nsPluginHostImpl.h
@@ -448,7 +448,9 @@ private:
 
   nsCOMPtr<nsIFile>                    mPluginRegFile;
   nsCOMPtr<nsIPrefBranch>              mPrefService;
+#ifdef XP_WIN
   nsRefPtr<nsPluginDirServiceProvider> mPrivateDirServiceProvider;
+#endif /* XP_WIN */
 
   nsWeakPtr mCurrentDocument; // weak reference, we use it to id document only