diff --git a/src/devices/machine/applefdc.h b/src/devices/machine/applefdc.h
index 87cc89f36dc..afdf13de0d8 100644
--- a/src/devices/machine/applefdc.h
+++ b/src/devices/machine/applefdc.h
@@ -149,6 +149,8 @@ public:
 	}
 
 	iwm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+	static constexpr feature_type imperfect_features() { return feature::DISK; }
 };
 
 #endif // MAME_MACHINE_APPLEFDC_H