diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 1045377..50e4392 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1400,12 +1400,15 @@
 	switch (*endp) {
 	case 'G':
 		result *= 1024;
+		fallthrough;
 	case 'M':
 		result *= 1024;
+		fallthrough;
 	case 'K':
 		result *= 1024;
 		if (endp[1] == 'i' && endp[2] == 'B')
 			endp += 2;
+		fallthrough;
 	case '\0':
 		break;
 	default: