diff --git a/include/image.mk b/include/image.mk
index d8cf93fa2c..cab9722df6 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -23,7 +23,7 @@ JFFS2OPTS     :=  --pad --big-endian --squash
 SQUASHFS_OPTS :=  -be
 endif
 
-ifneq ($(CONFIG_LINUX_2_6_30),)
+ifneq ($(CONFIG_LINUX_2_6_30)$(CONFIG_LINUX_2_6_31),)
 USE_SQUASHFS4 := y
 endif