diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0404cf4b8b..1809aecc00b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -181,7 +181,7 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 include_directories( ${LLVM_BINARY_DIR}/include ${LLVM_MAIN_INCLUDE_DIR})
 
 if( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
-   SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-include llvm/Support/Solaris.h")
+   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -include llvm/Support/Solaris.h")
 endif( ${CMAKE_SYSTEM_NAME} MATCHES SunOS )
 
 include(AddLLVM)