diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e66c5d..ec0df1f 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,7 @@ IF(APPLE)
             SET(CMAKE_OSX_SYSROOT ${CMAKE_OSX_SYSROOT} CACHE FILEPATH "isysroot used for universal binary support" FORCE)
         ENDIF(EXISTS ${CMAKE_OSX_SYSROOT})
 
-        IF(NOT ${CMAKE_OSX_ARCHITECTURES} STREQUAL "")
+        IF(NOT "${CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
             SET(CMAKE_OSX_ARCHITECTURES ${CMAKE_OSX_ARCHITECTURES} CACHE STRING "Build architectures for OSX" FORCE)
         ELSE()
             SET(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "Build architectures for OSX" FORCE)