diff --git a/disk/part.c b/disk/part.c
index b6bae1794..3ba88c7e8 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -109,13 +109,30 @@ block_dev_desc_t *get_dev(char* ifname, int dev)
 /*
  * reports device info to the user
  */
+
+#ifdef CONFIG_LBA48
+typedef uint64_t lba512_t;
+#else
+typedef lbaint_t lba512_t;
+#endif
+
+/*
+ * Overflowless variant of (block_count * mul_by / div_by)
+ * when div_by > mul_by
+ */
+static lba512_t lba512_muldiv (lba512_t block_count, lba512_t mul_by, lba512_t div_by)
+{
+	lba512_t bc_quot, bc_rem;
+
+	/* x * m / d == x / d * m + (x % d) * m / d */
+	bc_quot = block_count / div_by;
+	bc_rem  = block_count - div_by * bc_quot;
+	return bc_quot * mul_by + (bc_rem * mul_by) / div_by;
+}
+
 void dev_print (block_dev_desc_t *dev_desc)
 {
-#ifdef CONFIG_LBA48
-	uint64_t lba512; /* number of blocks if 512bytes block size */
-#else
-	lbaint_t lba512;
-#endif
+	lba512_t lba512; /* number of blocks if 512bytes block size */
 
 	if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 		puts ("not available\n");
@@ -184,8 +201,9 @@ void dev_print (block_dev_desc_t *dev_desc)
 		lba = dev_desc->lba;
 
 		lba512 = (lba * (dev_desc->blksz/512));
-		mb = (10 * lba512) / 2048;	/* 2048 = (1024 * 1024) / 512 MB */
 		/* round to 1 digit */
+		mb = lba512_muldiv(lba512, 10, 2048);	/* 2048 = (1024 * 1024) / 512 MB */
+
 		mb_quot	= mb / 10;
 		mb_rem	= mb - (10 * mb_quot);