diff --git a/sys/dev/acpica/acpi_apei.c b/sys/dev/acpica/acpi_apei.c
index 6a3d9d10edd4..9cfd46c97430 100644
--- a/sys/dev/acpica/acpi_apei.c
+++ b/sys/dev/acpica/acpi_apei.c
@@ -711,7 +711,7 @@ apei_attach(device_t dev)
 		if (ge->v1.Header.Type == ACPI_HEST_TYPE_GENERIC_ERROR_V2) {
 			ge->res2_rid = rid++;
 			acpi_bus_alloc_gas(dev, &ge->res2_type, &ge->res2_rid,
-			    &ge->v2.ReadAckRegister, &ge->res2, 0);
+			    &ge->v2.ReadAckRegister, &ge->res2, RF_SHAREABLE);
 			if (ge->res2 == NULL)
 				device_printf(dev, "Can't allocate ack resource.\n");
 		}