diff --git a/disk/part_efi.c b/disk/part_efi.c
index 59cd538..b555ff3 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -237,7 +237,7 @@
 	legacy_mbr *p_mbr;
 
 	/* Setup the Protective MBR */
-	p_mbr = calloc(1, sizeof(p_mbr));
+	p_mbr = (legacy_mbr *)calloc(1, sizeof(legacy_mbr));
 	if (p_mbr == NULL) {
 		printf("%s: calloc failed!\n", __func__);
 		return -1;