diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13e7bcf71..5b6f2f5da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,6 +114,7 @@ IF(UNIX)
 ELSEIF(MSVC)
   # for msvc, tell it to always use 8-byte pointers to member functions to avoid confusion
   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /vmg /vmm /MP")
+  SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /Od")
 ENDIF()
 
 # use shared libraries for protobuf