diff --git a/CMakeLists.txt b/CMakeLists.txt
index 070ca340d..c3c0d6a73 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,8 +44,8 @@ if(MSVC)
     set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /Od /Zi /EHa /utf-8")
 else()
     if (true)
-        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -fno-exceptions")
-        set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -gdwarf-3 -fno-exceptions")
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O0 -fno-exceptions")
+        set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -gdwarf-3 -O0 -fno-exceptions")
         set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -gdwarf-3 -O3 -fno-exceptions")
         set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -gdwarf-3 -fno-exceptions")
     else()