diff --git a/config/sources/families/k3.conf b/config/sources/families/k3.conf
index 6d7f89774..d8b26b752 100644
--- a/config/sources/families/k3.conf
+++ b/config/sources/families/k3.conf
@@ -64,6 +64,11 @@ function uboot_custom_postprocess() {
 	cp ${SRC}/cache/sources/ti-u-boot/${TIBOOT3_FILE} tiboot3.bin
 }
 
+function pre_prepare_partitions() {
+	# Filesystem must fill partition regardless of alignment
+	mkopts[fat]='-a'
+}
+
 function post_create_partitions() {
 	display_alert "Setting boot partition flags on" "${SDCARD}.raw" "debug"