diff --git a/devicemodel/arch/x86/pm.c b/devicemodel/arch/x86/pm.c
index 987be2c16..fcfc1b3dc 100644
--- a/devicemodel/arch/x86/pm.c
+++ b/devicemodel/arch/x86/pm.c
@@ -200,7 +200,7 @@ pm1_enable_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
 		 * the global lock, but ACPI-CA whines profusely if it
 		 * can't set GBL_EN.
 		 */
-		pm1_enable = *eax & (PM1_PWRBTN_EN | PM1_GBL_EN);
+		pm1_enable = *eax & (PM1_RTC_EN | PM1_PWRBTN_EN | PM1_GBL_EN);
 		sci_update(ctx);
 	}
 	pthread_mutex_unlock(&pm_lock);