diff --git a/CMakeLists.txt b/CMakeLists.txt
index 11d40c5..76ff6eb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,9 +36,10 @@ message("BUILD_VERSION:${BUILD_VERSION}")
 set(VERSION ${BUILD_VERSION})
 
 if(NOT DEFINED CMAKE_BUILD_TYPE)
-        set(CMAKE_BUILD_TYPE "Release")
+    set(CMAKE_BUILD_TYPE "Release")
 endif(NOT DEFINED CMAKE_BUILD_TYPE)
-if("Debug" STREQUAL CMAKE_BUILD_TYPE)
+string(TOLOWER "${CMAKE_BUILD_TYPE}" build_type)
+if("debug" STREQUAL build_type)
     add_definitions(-D_DEBUG)
 endif()