diff --git a/[refs] b/[refs]
index f6bdd2ade9da..bf1e2a7ce11b 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: eeb4437e63c39ce19cf9b2de36a1dddbf12910c4
+refs/heads/master: 7a4b8131ac7b47feb110b3e0142d4207ee79a025
diff --git a/trunk/drivers/acpi/parser/psxface.c b/trunk/drivers/acpi/parser/psxface.c
index 4985ce58c024..41b0c8c052a8 100644
--- a/trunk/drivers/acpi/parser/psxface.c
+++ b/trunk/drivers/acpi/parser/psxface.c
@@ -295,6 +295,22 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
 		goto cleanup;
 	}
 
+	/*
+	 * Start method evaluation with an implicit return of zero.
+	 * This is done for Windows compatibility.
+	 */
+	if (acpi_gbl_enable_interpreter_slack) {
+		walk_state->implicit_return_obj =
+		    acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
+		if (!walk_state->implicit_return_obj) {
+			status = AE_NO_MEMORY;
+			acpi_ds_delete_walk_state(walk_state);
+			goto cleanup;
+		}
+
+		walk_state->implicit_return_obj->integer.value = 0;
+	}
+
 	/* Parse the AML */
 
 	status = acpi_ps_parse_aml(walk_state);