diff --git a/src/interface/efi/efi_hii.c b/src/interface/efi/efi_hii.c
index 0ea970e67..506fc8869 100644
--- a/src/interface/efi/efi_hii.c
+++ b/src/interface/efi/efi_hii.c
@@ -117,6 +117,7 @@ static void * efi_ifr_op ( struct efi_ifr_builder *ifr, unsigned int opcode,
 	ifr->ops_len = new_ops_len;
 
 	/* Fill in opcode header */
+	memset ( op, 0, len );
 	op->OpCode = opcode;
 	op->Length = len;