diff --git a/lib/functions/image/partitioning.sh b/lib/functions/image/partitioning.sh
index 9f5f2b9d31ec..f423a85dfca5 100644
--- a/lib/functions/image/partitioning.sh
+++ b/lib/functions/image/partitioning.sh
@@ -189,6 +189,7 @@ function prepare_partitions() {
 				# Legacy BIOS partition
 				if [[ -n "$biospart" ]]; then
 					# gpt: BIOS boot
+					[[ "$IMAGE_PARTITION_TABLE" != "gpt" ]] && exit_with_error "Legacy BIOS partition is not allowed for MBR partition table (${BIOSSIZE} can't be >0)!"
 					local type="21686148-6449-6E6F-744E-656564454649"
 					echo "$biospart : name=\"bios\", start=${next}MiB, size=${BIOSSIZE}MiB, type=${type}"
 					local next=$(($next + $BIOSSIZE))