diff --git a/arch/i386/boot/edd.S b/arch/i386/boot/edd.S
index d8d69f2b911d62c909b651de0d9e61a7c7b3b461..4b84ea216f2b81ede738e80206a5fafd8e5ef994 100644
--- a/arch/i386/boot/edd.S
+++ b/arch/i386/boot/edd.S
@@ -76,6 +76,8 @@ edd_mbr_sig_read:
 	popw	%es
 	popw	%bx
 	jc	edd_mbr_sig_done		# on failure, we're done.
+	cmpb	$0, %ah		# some BIOSes do not set CF
+	jne	edd_mbr_sig_done		# on failure, we're done.
 	movl	(EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
 	movl	%eax, (%bx)			# store success
 	incb	(EDD_MBR_SIG_NR_BUF)		# note that we stored something