--- a/dom/media/gmp/GMPChild.cpp
+++ b/dom/media/gmp/GMPChild.cpp
@@ -122,17 +122,17 @@ GetPluginFile(const nsAString& aPluginPa
   nsAutoString binaryName =                            baseName + NS_LITERAL_STRING(".dll");
 #else
 #error not defined
 #endif
   aLibFile->AppendRelativePath(binaryName);
   return true;
 }
 
-#if !defined(XP_MACOSX)
+#if !defined(XP_MACOSX) || !defined(MOZ_GMP_SANDBOX)
 static bool
 GetPluginFile(const nsAString& aPluginPath,
               nsCOMPtr<nsIFile>& aLibFile)
 {
   nsCOMPtr<nsIFile> unusedlibDir;
   return GetPluginFile(aPluginPath, unusedlibDir, aLibFile);
 }
 #endif