diff --git a/sim/SimRsim.c b/sim/SimRsim.c
index 129a73f6..5088e8c3 100644
--- a/sim/SimRsim.c
+++ b/sim/SimRsim.c
@@ -553,7 +553,7 @@ SimRsimIt(cmd, nodeName)
     char *nodeName;
 {
 
-    static char cmdStr[256];
+    static char cmdStr[512];
     static char cleanName[256];
     char *strptr;