diff --git a/Modules/CMakeCommonLanguageInclude.cmake b/Modules/CMakeCommonLanguageInclude.cmake
index 5bd4b23a55..0dd8b65d74 100644
--- a/Modules/CMakeCommonLanguageInclude.cmake
+++ b/Modules/CMakeCommonLanguageInclude.cmake
@@ -99,15 +99,15 @@ macro(_cmake_common_language_platform_flags lang)
   # so unless the variable CMAKE_MODULE_EXISTS is set just
   # copy the values from the LIBRARY variables
   if(NOT CMAKE_MODULE_EXISTS)
-    set(CMAKE_SHARED_MODULE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_${lang}_FLAGS})
-    set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS})
+    set(CMAKE_SHARED_MODULE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_${lang}_FLAGS}")
+    set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS}")
   endif()
 
   if(NOT DEFINED CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS)
-    set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
+    set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS}")
   endif()
   if(NOT DEFINED CMAKE_SHARED_MODULE_${lang}_FLAGS)
-    set(CMAKE_SHARED_MODULE_${lang}_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
+    set(CMAKE_SHARED_MODULE_${lang}_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
   endif()
 
   foreach(type IN ITEMS SHARED_LIBRARY SHARED_MODULE EXE)