diff --git a/src/soc/intel/baytrail/bootblock/bootblock.c b/src/soc/intel/baytrail/bootblock/bootblock.c
index fa8283c..3f07a6b 100644
--- a/src/soc/intel/baytrail/bootblock/bootblock.c
+++ b/src/soc/intel/baytrail/bootblock/bootblock.c
@@ -89,7 +89,7 @@
 	reg = 0;
 	/* Clear the extended register. */
 	pci_io_write_config32(IOSF_PCI_DEV, MCRX_REG, reg);
-	reg = CONFIG_MMCONF_BASE_ADDRESS | 1;
+	reg = CONFIG_ECAM_MMCONF_BASE_ADDRESS | 1;
 	pci_io_write_config32(IOSF_PCI_DEV, MDR_REG, reg);
 	reg = IOSF_OPCODE(IOSF_OP_WRITE_BUNIT) | IOSF_PORT(IOSF_PORT_BUNIT) |
 	      IOSF_REG(BUNIT_MMCONF_REG) | IOSF_BYTE_EN;