diff --git a/VAX/vax610_syslist.c b/VAX/vax610_syslist.c
index 72429994..e38d1ce5 100644
--- a/VAX/vax610_syslist.c
+++ b/VAX/vax610_syslist.c
@@ -29,7 +29,7 @@
 
 #include "vax_defs.h"
 
-char sim_name[32] = "MicroVAX I (KA610)";
+char sim_name[] = "MicroVAX I (KA610)";
 
 void vax_init(void)
 {
diff --git a/VAX/vax630_syslist.c b/VAX/vax630_syslist.c
index 9d0e5ab6..f7af8eb6 100644
--- a/VAX/vax630_syslist.c
+++ b/VAX/vax630_syslist.c
@@ -30,14 +30,14 @@
 #include "vax_defs.h"
 
 #if defined(VAX_620)
-char sim_name[32] = "rtVAX1000 (KA620)";
+char sim_name[] = "rtVAX1000 (KA620)";
 
 void vax_init(void)
 {
 sim_savename = "rtVAX1000 (KA620)";
 }
 #else
-char sim_name[32] = "MicroVAX II (KA630)";
+char sim_name[] = "MicroVAX II (KA630)";
 
 void vax_init(void)
 {
diff --git a/VAX/vax_syslist.c b/VAX/vax_syslist.c
index c66bd4df..b1c17e6e 100644
--- a/VAX/vax_syslist.c
+++ b/VAX/vax_syslist.c
@@ -30,7 +30,7 @@
 
 #include "vax_defs.h"
 
-char sim_name[64] = "MicroVAX 3900";
+char sim_name[] = "MicroVAX 3900";
 
 void vax_init(void)
 {
diff --git a/scp.h b/scp.h
index fa98dd63..413ea308 100644
--- a/scp.h
+++ b/scp.h
@@ -307,7 +307,7 @@ void sim_aio_activate (ACTIVATE_API caller, UNIT *uptr, int32 event_time);
 
 /* VM interface */
 
-extern char sim_name[];
+extern char sim_name[64];
 extern DEVICE *sim_devices[];
 extern REG *sim_PC;
 extern const char *sim_stop_messages[SCPE_BASE];