diff --git a/VAX/vax_cpu.c b/VAX/vax_cpu.c
index a2aa2bab..cf8f5ebd 100644
--- a/VAX/vax_cpu.c
+++ b/VAX/vax_cpu.c
@@ -475,6 +475,7 @@ MTAB cpu_mod[] = {
       &cpu_set_hist, &cpu_show_hist },
     { MTAB_XTD|MTAB_VDV|MTAB_NMO|MTAB_SHP, 0, "VIRTUAL", NULL,
       NULL, &cpu_show_virt },
+    CPU_MODEL_MODIFIERS /* Model specific cpu modifiers from vaxXXX_defs.h */
     { 0 }
     };
 
diff --git a/VAX/vax_defs.h b/VAX/vax_defs.h
index fb49cb23..601d73b3 100644
--- a/VAX/vax_defs.h
+++ b/VAX/vax_defs.h
@@ -739,5 +739,8 @@ void cpu_idle (void);
 #else
 #include "vaxmod_defs.h"
 #endif
+#ifndef CPU_MODEL_MODIFIERS
+#define CPU_MODEL_MODIFIERS             /* No model specific CPU modifiers */
+#endif
 
 #endif                                                  /* _VAX_DEFS_H */