diff --git a/Makefile b/Makefile
index 81448206..544410e6 100644
--- a/Makefile
+++ b/Makefile
@@ -84,6 +84,7 @@ LIBBTRFSUTIL_CFLAGS = $(SUBST_CFLAGS) \
 		      -fvisibility=hidden \
 		      -I$(TOPDIR)/libbtrfsutil \
 		      $(EXTRAWARN_CFLAGS) \
+		      $(DEBUG_CFLAGS_INTERNAL) \
 		      $(EXTRA_CFLAGS)
 
 LDFLAGS = $(SUBST_LDFLAGS) \