diff --git a/meta/classes-recipe/image_types.bbclass
b/meta/classes-recipe/image_types.bbclass
index ca13729225..c0b3a78013 100644
--- a/meta/classes-recipe/image_types.bbclass
+++ b/meta/classes-recipe/image_types.bbclass
@@ -72,6 +72,17 @@ IMAGE_CMD:jffs2 = "mkfs.jffs2 --root=${IMAGE_ROOTFS}
--faketime --output=${IMGDE

 IMAGE_CMD:cramfs = "mkfs.cramfs ${IMAGE_ROOTFS}
${IMGDEPLOYDIR}/${IMAGE_NAME}.cramfs ${EXTRA_IMAGECMD}"

+# Derive a deterministic directory hash seed from SOURCE_DATE_EPOCH so
+# reproducible builds get stable ext2/3/4 directory indexes
+def oe_ext234_hash_seed(d):
+    sde = d.getVar('SOURCE_DATE_EPOCH')
+    if not sde:
+        return ''
+    import uuid
+    return
str(uuid.uuid5(uuid.UUID('e7429877-e7b3-4a68-a5c9-2f2fdf33d460'), sde))
+
+REPRODUCIBLE_EXT234_HASH_SEED ?= "${@oe_ext234_hash_seed(d)}"
+
 oe_mkext234fs () {