diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e9089ae..c99bedf3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,7 @@ if(ENABLE_HLSL)
 endif(ENABLE_HLSL)
 
 if(WIN32)
-    set(CMAKE_DEBUG_POSTFIX "d")
+    set(CMAKE_DEBUG_POSTFIX "d" CACHE STRING "Adds a postfix for debug-built libraries.")
     if(MSVC)
         include(ChooseMSVCCRT.cmake)
     endif(MSVC)