diff --git a/src/soc/intel/apollolake/include/soc/pm.h b/src/soc/intel/apollolake/include/soc/pm.h
index fe7a4230e9..6b12886c07 100644
--- a/src/soc/intel/apollolake/include/soc/pm.h
+++ b/src/soc/intel/apollolake/include/soc/pm.h
@@ -89,6 +89,7 @@
 #define TCO_STS			0x64
 #define   TCO_TIMEOUT		(1 << 3)
 #define TCO1_CNT		0x68
+#define   TCO_TMR_HLT		(1 << 11)
 
 #define GPE0_REG_MAX		4
 #define GPE0_REG_SIZE		32
diff --git a/src/soc/intel/apollolake/romstage.c b/src/soc/intel/apollolake/romstage.c
index da537996dc..cfef483d67 100644
--- a/src/soc/intel/apollolake/romstage.c
+++ b/src/soc/intel/apollolake/romstage.c
@@ -94,9 +94,9 @@ static void disable_watchdog(void)
 	uint32_t reg;
 
 	/* Stop TCO timer */
-	reg = inl(ACPI_PMIO_BASE + 0x68);
-	reg |= 1 << 11;
-	outl(reg, ACPI_PMIO_BASE + 0x68);
+	reg = inl(ACPI_PMIO_BASE + TCO1_CNT);
+	reg |= TCO_TMR_HLT;
+	outl(reg, ACPI_PMIO_BASE + TCO1_CNT);
 }
 
 static void migrate_power_state(int is_recovery)