diff --git a/tests/ts/cramfs/mkfs-endianness b/tests/ts/cramfs/mkfs-endianness
index e3913d65e..e3e3ffc2d 100755
--- a/tests/ts/cramfs/mkfs-endianness
+++ b/tests/ts/cramfs/mkfs-endianness
@@ -45,9 +45,9 @@ test_image() {
 rm -rf "$IMAGE_DATA"
 mkdir -p $IMAGE_DATA/dirA/dirB
 yes "Testing cramfs 1234567890 Endianness check 1234567890 Endianness check" \
-	| dd of=$IMAGE_DATA/dirA/dirB/a bs=512 count=1 &> /dev/null
+	| dd of=$IMAGE_DATA/dirA/dirB/a iflag=fullblock bs=512 count=1 &> /dev/null
 yes "Testing cramfs 1234567890 Endianness check 1234567890 Endianness check" \
-	| dd of=$IMAGE_DATA/dirA/dirB/b bs=512 count=30 &> /dev/null
+	| dd of=$IMAGE_DATA/dirA/dirB/b iflag=fullblock bs=512 count=30 &> /dev/null
 # sudo may use whatever group
 chgrp -R 0 $IMAGE_DATA