diff --git a/src/mess/machine/nes_slot.c b/src/mess/machine/nes_slot.c
index 3ac3bfaa356..09d510b1180 100644
--- a/src/mess/machine/nes_slot.c
+++ b/src/mess/machine/nes_slot.c
@@ -1,6 +1,6 @@
 #include "emu.h"
 #include "machine/nes_slot.h"
-
+#include "hashfile.h"
 
 #define NES_BATTERY_SIZE 0x2000
 
@@ -268,7 +268,7 @@ bool base_nes_cart_slot_device::call_load()
 				bool ines20 = FALSE, has_trainer = FALSE, prg16k;
 				
 				// check if the image is recognized by nes.hsi
-//              mapinfo = hashfile_extrainfo(image);
+				mapinfo = hashfile_extrainfo(*this);
 				
 				// image_extrainfo() resets the file position back to start.
 				fseek(0, SEEK_SET);
diff --git a/src/mess/machine/nes_slot.h b/src/mess/machine/nes_slot.h
index 93f0d8295ec..1d8cd706766 100644
--- a/src/mess/machine/nes_slot.h
+++ b/src/mess/machine/nes_slot.h
@@ -84,6 +84,8 @@ public:
 	bool m_has_battery, m_has_prgram; 
 };
 
+extern void nes_partialhash(hash_collection &dest, const unsigned char *data, unsigned long length, const char *functions);
+
 
 // ======================> nes_cart_slot_device
 
@@ -115,6 +117,7 @@ public:
 	virtual const char *image_interface() const { return "nes_cart"; }
 	virtual const char *file_extensions() const { return "nes,unf,unif"; }
 	virtual const option_guide *create_option_guide() const { return NULL; }
+	virtual device_image_partialhash_func get_partial_hash() const { return &nes_partialhash; }
 	
 	// slot interface overrides
 	virtual const char * get_default_card_software(const machine_config &config, emu_options &options);