diff --git a/default-configs/sparc64-softmmu.mak b/default-configs/sparc64-softmmu.mak
index 52edafe547..ce63d47046 100644
--- a/default-configs/sparc64-softmmu.mak
+++ b/default-configs/sparc64-softmmu.mak
@@ -16,5 +16,4 @@ CONFIG_SIMBA=y
 CONFIG_SUNHME=y
 CONFIG_MC146818RTC=y
 CONFIG_ISA_TESTDEV=y
-CONFIG_EMPTY_SLOT=y
 CONFIG_SUN4V_RTC=y
diff --git a/hw/sparc64/niagara.c b/hw/sparc64/niagara.c
index 4fa8cb2904..f8a856f611 100644
--- a/hw/sparc64/niagara.c
+++ b/hw/sparc64/niagara.c
@@ -29,7 +29,7 @@
 #include "hw/hw.h"
 #include "hw/boards.h"
 #include "hw/char/serial.h"
-#include "hw/empty_slot.h"
+#include "hw/misc/unimp.h"
 #include "hw/loader.h"
 #include "hw/sparc/sparc64.h"
 #include "hw/timer/sun4v-rtc.h"
@@ -161,7 +161,7 @@ static void niagara_init(MachineState *machine)
         serial_mm_init(sysmem, NIAGARA_UART_BASE, 0, NULL, 115200,
                        serial_hd(0), DEVICE_BIG_ENDIAN);
     }
-    empty_slot_init(NIAGARA_IOBBASE, NIAGARA_IOBSIZE);
+    create_unimplemented_device("sun4v-iob", NIAGARA_IOBBASE, NIAGARA_IOBSIZE);
     sun4v_rtc_init(NIAGARA_RTC_BASE);
 }