diff --git a/src/mame/machine/gdcrypt.c b/src/mame/machine/gdcrypt.c
index 012bcddb5a4..505e29d22a0 100644
--- a/src/mame/machine/gdcrypt.c
+++ b/src/mame/machine/gdcrypt.c
@@ -339,6 +339,7 @@ void naomi_game_decrypt(running_machine* machine, UINT64 key, UINT8* region, int
 
 	des_generate_subkeys (rev64(key), des_subkeys);
 
+	#ifdef MAME_DEBUG
 	/* save the original file */
 	{
 		FILE *fp;
@@ -351,6 +352,7 @@ void naomi_game_decrypt(running_machine* machine, UINT64 key, UINT8* region, int
 			fclose(fp);
 		}
 	}
+	#endif
 
 	for(i=0;i<length;i+=8)
 	{
@@ -362,6 +364,7 @@ void naomi_game_decrypt(running_machine* machine, UINT64 key, UINT8* region, int
 	 	write_from_qword(region+i, ret);
 	}
 
+	#ifdef MAME_DEBUG
 	/* save the decrypted file */
 	{
 		FILE *fp;
@@ -374,6 +377,6 @@ void naomi_game_decrypt(running_machine* machine, UINT64 key, UINT8* region, int
 			fclose(fp);
 		}
 	}
-
+	#endif
 }