diff --git a/lib/functions/image/partitioning.sh b/lib/functions/image/partitioning.sh
index ea4ce16fb1..5244673229 100644
--- a/lib/functions/image/partitioning.sh
+++ b/lib/functions/image/partitioning.sh
@@ -129,7 +129,7 @@ function prepare_partitions() {
 		display_alert "Using user-defined image size" "$FIXED_IMAGE_SIZE MiB" "info"
 		sdsize=$FIXED_IMAGE_SIZE
 		# basic sanity check
-		if [[ $ROOTFS_TYPE != nfs && $sdsize -lt $rootfs_size ]]; then
+		if [[ $ROOTFS_TYPE != nfs && $ROOTFS_TYPE != btrfs && $sdsize -lt $rootfs_size ]]; then
 			exit_with_error "User defined image size is too small" "$sdsize <= $rootfs_size"
 		fi
 	else