diff --git a/fs/ext2/ext2.mk b/fs/ext2/ext2.mk
index 68b3b813c3..f3d3ff92fe 100644
--- a/fs/ext2/ext2.mk
+++ b/fs/ext2/ext2.mk
@@ -18,7 +18,7 @@ ifneq ($(strip $(BR2_TARGET_ROOTFS_EXT2_INODES)),0)
 EXT2_OPTS += -N $(BR2_TARGET_ROOTFS_EXT2_INODES)
 endif
 
-ifneq ($(strip $(BR2_TARGET_ROOTFS_EXT2_RESBLKS)),)
+ifneq ($(strip $(BR2_TARGET_ROOTFS_EXT2_RESBLKS)),0)
 EXT2_OPTS += -m $(BR2_TARGET_ROOTFS_EXT2_RESBLKS)
 endif