diff --git a/10.01_base/2_src/arm/gpios.cpp b/10.01_base/2_src/arm/gpios.cpp
index 793d237..89905d1 100644
--- a/10.01_base/2_src/arm/gpios.cpp
+++ b/10.01_base/2_src/arm/gpios.cpp
@@ -999,7 +999,7 @@ void unibus_signals_c::set_val(enum unibus_signal_info_c::id_enum id, unsigned v
 	case unibus_signal_info_c::ub_address:
 		buslatches_setval(2, 0xff, value); // ADDR0:7
 		buslatches_setval(3, 0xff, value >> 8); // ADDR8:15
-		buslatches_setval(4, 0x03, value >> 12); // ADDR16,17
+		buslatches_setval(4, 0x03, value >> 16); // ADDR16,17
 		break;
 	case unibus_signal_info_c::ub_data:
 		buslatches_setval(5, 0xff, value); // DATA0:7