diff --git a/security/coreconf/command.mk b/security/coreconf/command.mk
index 7789b3f7d49e..77665f91878f 100644
--- a/security/coreconf/command.mk
+++ b/security/coreconf/command.mk
@@ -42,7 +42,7 @@ CCF           = $(CC) $(CFLAGS)
 LINK_DLL      = $(LINK) $(OS_DLLFLAGS) $(DLLFLAGS)
 LINK_EXE      = $(LINK) $(OS_LFLAGS) $(LFLAGS)
 NFSPWD        = $(NSINSTALL_DIR)/nfspwd
-CFLAGS       += $(OPTIMIZER) $(OS_CFLAGS) $(XP_DEFINE) $(DEFINES) $(INCLUDES) \
+CFLAGS        = $(OPTIMIZER) $(OS_CFLAGS) $(XP_DEFINE) $(DEFINES) $(INCLUDES) \
 		$(XCFLAGS)
 RANLIB        = echo
 TAR           = /bin/tar