diff --git a/src/build/Common.gmake b/src/build/Common.gmake
index 1dbd7e92bf4082a59781736552d14abe1d34fb47..dfe8dfc73bcee3cc220298696e70118681dfa373 100644
--- a/src/build/Common.gmake
+++ b/src/build/Common.gmake
@@ -150,7 +150,7 @@ ifdef DEBUG
   LDFLAGS	+=	-fprofile-arcs -ftest-coverage
  endif
  ifdef FORTIFY
-  CFLAGS += -O1
+  CFLAGS += -Og
  endif
  ifdef SANITIZE
   CFLAGS += -fsanitize=undefined,address -fno-omit-frame-pointer