diff --git a/toolchains/common.cmake b/toolchains/common.cmake
index 8048ca7..295bed1 100644
--- a/toolchains/common.cmake
+++ b/toolchains/common.cmake
@@ -16,7 +16,7 @@
     string(APPEND CMAKE_${language}_FLAGS_INIT "-fdata-sections ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-Wall -Werror ")
     string(APPEND CMAKE_${language}_FLAGS_INIT "-gdwarf-4 ")
-    string(APPEND CMAKE_${language}_FLAGS_DEBUG_INIT "-Og ")
+    string(APPEND CMAKE_${language}_FLAGS_DEBUG_INIT "-Og -Wnull-dereference ")
     string(APPEND CMAKE_${language}_FLAGS_RELEASE_INIT "-g ")
 endforeach()