diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1d28f61..342e6b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,7 +108,7 @@
 set(CMAKE_C_FLAGS         "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_COVERAGE} -Wall -Wextra -Wno-missing-field-initializers -std=c99")
 set(CMAKE_C_FLAGS_RELEASE "-O2 -DNDEBUG")
 set(CMAKE_C_FLAGS_PACKAGE "-g -O2 -DNDEBUG")
-set(CMAKE_C_FLAGS_DEBUG   "-g -O0")
+set(CMAKE_C_FLAGS_DEBUG   "-g -Og")
 
 include_directories(${PROJECT_BINARY_DIR}/src ${PROJECT_SOURCE_DIR}/src)
 configure_file(${PROJECT_SOURCE_DIR}/src/config.h.in ${PROJECT_BINARY_DIR}/src/config.h @ONLY)