2 files changed, 3 insertions, 3 deletions

diff --git a/Config.mk b/Config.mk
index 01644b167c..fbd65436da 100644
--- a/Config.mk
+++ b/Config.mk
@@ -57,9 +57,7 @@ define cc-ver-check-closure
     endif
 endef
 
-ifneq ($(debug),y)
-CFLAGS += -DNDEBUG
-else
+ifeq ($(debug),y)
 CFLAGS += -g
 endif
 
diff --git a/xen/Rules.mk b/xen/Rules.mk
index db2447a450..0b8de6e389 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -17,6 +17,8 @@ include $(XEN_ROOT)/Config.mk
 ifeq ($(debug),y)
 verbose       := y
 frame_pointer := y
+else
+CFLAGS += -DNDEBUG
 endif
 ifeq ($(perfc_arrays),y)
 perfc := y