diff --git a/build/jam/ArchitectureRules b/build/jam/ArchitectureRules
index 03a6f3b000..e55eba9138 100644
--- a/build/jam/ArchitectureRules
+++ b/build/jam/ArchitectureRules
@@ -519,7 +519,7 @@ rule ArchitectureSetupWarnings architecture
 #	EnableWerror src add-ons input_server methods pen ;
 	EnableWerror src add-ons input_server methods t9 ;
 	EnableWerror src add-ons kernel bluetooth ;
-#	EnableWerror src add-ons kernel bus_managers acpi ;
+	EnableWerror src add-ons kernel bus_managers acpi ;
 	EnableWerror src add-ons kernel bus_managers agp_gart ;
 	EnableWerror src add-ons kernel bus_managers ata ;
 	EnableWerror src add-ons kernel bus_managers config_manager ;