diff --git a/Source/CPack/cmCPackGeneratorFactory.cxx b/Source/CPack/cmCPackGeneratorFactory.cxx
index 37ff46041..eba1ef92d 100644
--- a/Source/CPack/cmCPackGeneratorFactory.cxx
+++ b/Source/CPack/cmCPackGeneratorFactory.cxx
@@ -61,6 +61,8 @@ cmCPackGeneratorFactory::cmCPackGeneratorFactory()
     {
     this->RegisterGenerator("NSIS", "Null Soft Installer",
       cmCPackNSISGenerator::CreateGenerator);
+    this->RegisterGenerator("NSIS64", "Null Soft Installer (64-bit)",
+      cmCPackNSISGenerator::CreateGenerator64);
     }
 #ifdef __CYGWIN__
   if (cmCPackCygwinBinaryGenerator::CanGenerate())
diff --git a/Source/CPack/cmCPackNSISGenerator.cxx b/Source/CPack/cmCPackNSISGenerator.cxx
index fdbae3504..9f86ea272 100644
--- a/Source/CPack/cmCPackNSISGenerator.cxx
+++ b/Source/CPack/cmCPackNSISGenerator.cxx
@@ -33,8 +33,9 @@
 #endif
 
 //----------------------------------------------------------------------
-cmCPackNSISGenerator::cmCPackNSISGenerator()
+cmCPackNSISGenerator::cmCPackNSISGenerator(bool nsis64)
 {
+  Nsis64 = nsis64;
 }
 
 //----------------------------------------------------------------------
@@ -359,6 +360,21 @@ int cmCPackNSISGenerator::InitializeInternal()
   bool gotRegValue = false;
 
 #ifdef _WIN32
+  if (Nsis64)
+    {
+    if ( !gotRegValue && cmsys::SystemTools::ReadRegistryValue(
+      "HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS\\Unicode", nsisPath,
+      cmsys::SystemTools::KeyWOW64_64) )
+      {
+      gotRegValue = true;
+      }
+    if ( !gotRegValue && cmsys::SystemTools::ReadRegistryValue(
+      "HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS", nsisPath,
+      cmsys::SystemTools::KeyWOW64_64) )
+      {
+      gotRegValue = true;
+      }
+    }
   if ( !gotRegValue && cmsys::SystemTools::ReadRegistryValue(
       "HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS\\Unicode", nsisPath,
       cmsys::SystemTools::KeyWOW64_32) )
diff --git a/Source/CPack/cmCPackNSISGenerator.h b/Source/CPack/cmCPackNSISGenerator.h
index 82248546f..e46fbdab7 100644
--- a/Source/CPack/cmCPackNSISGenerator.h
+++ b/Source/CPack/cmCPackNSISGenerator.h
@@ -27,10 +27,13 @@ class cmCPackNSISGenerator : public cmCPackGenerator
 public:
   cmCPackTypeMacro(cmCPackNSISGenerator, cmCPackGenerator);
 
+  static cmCPackGenerator* CreateGenerator64()
+    { return new cmCPackNSISGenerator(true); }
+
   /**
    * Construct generator
    */
-  cmCPackNSISGenerator();
+  cmCPackNSISGenerator(bool nsis64 = false);
   virtual ~cmCPackNSISGenerator();
 
 protected:
@@ -77,6 +80,8 @@ protected:
   /// Translations any newlines found in the string into \\r\\n, so that the
   /// resulting string can be used within NSIS.
   static std::string TranslateNewlines(std::string str);
+
+  bool Nsis64;
 };
 
 #endif