diff --git a/Chapter07/error_handling/CMakeLists.txt b/Chapter07/error_handling/CMakeLists.txt
index 95e2535..29cdd1e 100644
--- a/Chapter07/error_handling/CMakeLists.txt
+++ b/Chapter07/error_handling/CMakeLists.txt
@@ -42,8 +42,8 @@ set(CMAKE_C_FLAGS "${COMMON_FLAGS}")
 set(CMAKE_CXX_FLAGS "${COMMON_FLAGS} -Wno-register ${EXCEPTIONS_FLAGS} -fno-threadsafe-statics")
 set(CMAKE_ASM_FLAGS "${COMMON_FLAGS} -x assembler-with-cpp")
 
-set(CMAKE_C_FLAGS_DEBUG "-g -gdwarf-2 -O0")
-set(CMAKE_CXX_FLAGS_DEBUG "-g -gdwarf-2 -O0")
+set(CMAKE_C_FLAGS_DEBUG "-g -gdwarf-2 -Og")
+set(CMAKE_CXX_FLAGS_DEBUG "-g -gdwarf-2 -Og")
 set(CMAKE_C_FLAGS_RELEASE "-O2 -flto")
 set(CMAKE_CXX_FLAGS_RELEASE "-O2 -flto")
 set(CMAKE_C_FLAGS_MINSIZEREL "-Os -flto")