diff --git a/Modules/Platform/Darwin.cmake b/Modules/Platform/Darwin.cmake
index f3da4099f..c0a86000a 100644
--- a/Modules/Platform/Darwin.cmake
+++ b/Modules/Platform/Darwin.cmake
@@ -158,7 +158,7 @@ SET(CMAKE_OSX_ARCHITECTURES_DEFAULT ${_CMAKE_OSX_MACHINE})
 IF(NOT "$ENV{CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
   SET(CMAKE_OSX_ARCHITECTURES_VALUE "$ENV{CMAKE_OSX_ARCHITECTURES}")
 ELSE(NOT "$ENV{CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
-  SET(CMAKE_OSX_ARCHITECTURES_VALUE "{CMAKE_OSX_ARCHITECTURES_DEFAULT}")
+  SET(CMAKE_OSX_ARCHITECTURES_VALUE "${CMAKE_OSX_ARCHITECTURES_DEFAULT}")
 ENDIF(NOT "$ENV{CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
 
 # now put _CMAKE_OSX_MACHINE into the cache