diff --git a/sys/dev/acpica/acpi_ec.c b/sys/dev/acpica/acpi_ec.c
index b339ba10ed0..c101292b7e4 100644
--- a/sys/dev/acpica/acpi_ec.c
+++ b/sys/dev/acpica/acpi_ec.c
@@ -469,6 +469,7 @@ acpi_ec_attach(device_t dev)
     sc->ec_gpehandle = params->gpe_handle;
     sc->ec_uid = params->uid;
     sc->ec_suspending = FALSE;
+    acpi_set_private(dev, NULL);
     free(params, M_TEMP);
 
     /* Attach bus resources for data and command/status ports. */