diff --git a/src/soc/intel/cannonlake/pmc.c b/src/soc/intel/cannonlake/pmc.c
index aebcfc9482..4dabb2ecef 100644
--- a/src/soc/intel/cannonlake/pmc.c
+++ b/src/soc/intel/cannonlake/pmc.c
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2008-2009 coresystems GmbH
  * Copyright (C) 2014 Google Inc.
- * Copyright (C) 2017 Intel Corporation.
+ * Copyright (C) 2017-2019 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -33,8 +33,9 @@
 static void pmc_set_afterg3(struct device *dev, int s5pwr)
 {
 	uint8_t reg8;
+	uint8_t *pmcbase = pmc_mmio_regs();
 
-	reg8 = pci_read_config8(dev, GEN_PMCON_B);
+	reg8 = read8(pmcbase + GEN_PMCON_A);
 
 	switch (s5pwr) {
 	case MAINBOARD_POWER_STATE_OFF:
@@ -48,7 +49,7 @@ static void pmc_set_afterg3(struct device *dev, int s5pwr)
 		break;
 	}
 
-	pci_write_config8(dev, GEN_PMCON_B, reg8);
+	write8(pmcbase + GEN_PMCON_A, reg8);
 }
 
 /*