diff --git a/AltairZ80/altairz80_dsk.c b/AltairZ80/altairz80_dsk.c
index b02ed6ba..2045718d 100644
--- a/AltairZ80/altairz80_dsk.c
+++ b/AltairZ80/altairz80_dsk.c
@@ -164,6 +164,7 @@ int32 dsk12(const int32 port, const int32 io, const int32 data);
 static t_stat dsk_boot(int32 unitno, DEVICE *dptr);
 static t_stat dsk_reset(DEVICE *dptr);
 static t_stat dsk_attach(UNIT *uptr, CONST char *cptr);
+static const char* dsk_description(DEVICE *dptr);
 
 extern UNIT cpu_unit;
 extern uint32 PCX;
diff --git a/AltairZ80/altairz80_sys.c b/AltairZ80/altairz80_sys.c
index 3345cef4..f6e33621 100644
--- a/AltairZ80/altairz80_sys.c
+++ b/AltairZ80/altairz80_sys.c
@@ -525,6 +525,9 @@ t_stat fprint_sym(FILE *of, t_addr addr, t_value *val, UNIT *uptr, int32 sw) {
             r = m68k_disassemble(disasm_result, addr, M68K_CPU_TYPE_68000);
             break;
 
+        default:
+            return SCPE_IERR;
+            
     }
     fprintf(of, "%s", disasm_result);
     return 1 - r;