diff --git a/CMakeLists.txt b/CMakeLists.txt
index d3f4f0e..7230770 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,8 @@ elseif(${IS_CLANG})
     endif()
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto=full -fwhole-program-vtables -fstrict-vtable-pointers")
 endif()
-if (CMAKE_BUILD_TYPE STREQUAL "Release")
+string(TOUPPER ${CMAKE_BUILD_TYPE} UPPERCASE_BUILD_TYPE)
+if (UPPERCASE_BUILD_TYPE STREQUAL RELEASE)
     add_definitions(-DYBCON_FLAGS="${CMAKE_CXX_FLAGS_RELEASE}")
 endif()
 add_definitions(-DYBCON_COMPILER="${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")