diff --git a/tools/debugger/kdd/Makefile b/tools/debugger/kdd/Makefile
index 72ad1b9601..f3a597ddbc 100644
--- a/tools/debugger/kdd/Makefile
+++ b/tools/debugger/kdd/Makefile
@@ -1,6 +1,7 @@
 XEN_ROOT = $(CURDIR)/../../..
 include $(XEN_ROOT)/tools/Rules.mk
 
+CFLAGS  += -Werror
 CFLAGS  += $(CFLAGS_libxenctrl)
 CFLAGS  += -DXC_WANT_COMPAT_MAP_FOREIGN_API
 LDLIBS  += $(LDLIBS_libxenctrl)