diff --git a/src/soc/amd/common/block/pci/amd_pci_mmconf.c b/src/soc/amd/common/block/pci/amd_pci_mmconf.c
index e02bcde248..e436c112f6 100644
--- a/src/soc/amd/common/block/pci/amd_pci_mmconf.c
+++ b/src/soc/amd/common/block/pci/amd_pci_mmconf.c
@@ -10,8 +10,8 @@ void enable_pci_mmconf(void)
 {
 	msr_t mmconf;
 
-	mmconf.hi = 0;
-	mmconf.lo = CONFIG_ECAM_MMCONF_BASE_ADDRESS | MMIO_RANGE_EN
+	mmconf.hi = (uint64_t)CONFIG_ECAM_MMCONF_BASE_ADDRESS >> 32;
+	mmconf.lo = (CONFIG_ECAM_MMCONF_BASE_ADDRESS & 0xfff00000) | MMIO_RANGE_EN
 			| __fls(CONFIG_ECAM_MMCONF_BUS_NUMBER) << MMIO_BUS_RANGE_SHIFT;
 	wrmsr(MMIO_CONF_BASE, mmconf);
 }