diff --git a/Makefile b/Makefile
index 243701a1..b1f33882 100644
--- a/Makefile
+++ b/Makefile
@@ -97,7 +97,7 @@ CHECKER := sparse
 check_defs := .cc-defines.h
 CHECKER_FLAGS := -include $(check_defs) -D__CHECKER__ \
 	-D__CHECK_ENDIAN__ -Wbitwise -Wuninitialized -Wshadow -Wundef \
-	-U_FORTIFY_SOURCE
+	-U_FORTIFY_SOURCE -Wdeclaration-after-statement -Wdefault-bitfield-sign
 
 objects = ctree.o disk-io.o kernel-lib/radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o file-item.o inode-item.o inode-map.o \