diff --git a/etc/cflags.cmake b/etc/cflags.cmake
index 12317e30457870252bd7213aa17b26472bf4217b..623809d64e1c04a1b2fc822e383432b0b0e59655 100644
--- a/etc/cflags.cmake
+++ b/etc/cflags.cmake
@@ -15,6 +15,6 @@ if (${IS_CLANG_COMPILER})
 endif ()
 
 # add some flags for the Release, Debug, and DebugSan modes
-set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb3 -Og")
+set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb3 -O0")
 set (CMAKE_CXX_FLAGS_DEBUGASAN "${CMAKE_CXX_FLAGS_DEBUG} -fsanitize=undefined -fsanitize=address")
 set (CMAKE_CXX_FLAGS_RELASAN "${CMAKE_CXX_FLAGS_RELEASE} -fsanitize=undefined -fsanitize=address")