diff --git a/sys/dev/intpm/intpm.c b/sys/dev/intpm/intpm.c
index 15da5e861a07..5ab2249c6691 100644
--- a/sys/dev/intpm/intpm.c
+++ b/sys/dev/intpm/intpm.c
@@ -525,12 +525,19 @@ intsmb_error(device_t dev, int status)
 {
 	int error = 0;
 
+	/*
+	 * PIIX4_SMBHSTSTAT_ERR can mean either of
+	 * - SMB_ENOACK ("Unclaimed cycle"),
+	 * - SMB_ETIMEOUT ("Host device time-out"),
+	 * - SMB_EINVAL ("Illegal command field").
+	 * SMB_ENOACK seems to be most typical.
+	 */
 	if (status & PIIX4_SMBHSTSTAT_ERR)
-		error |= SMB_EBUSERR;
+		error |= SMB_ENOACK;
 	if (status & PIIX4_SMBHSTSTAT_BUSC)
 		error |= SMB_ECOLLI;
 	if (status & PIIX4_SMBHSTSTAT_FAIL)
-		error |= SMB_ENOACK;
+		error |= SMB_EABORT;
 
 	if (error != 0 && bootverbose)
 		device_printf(dev, "error = %d, status = %#x\n", error, status);