diff --git a/pardef.c b/pardef.c
index 187b56f..a89eff7 100644
--- a/pardef.c
+++ b/pardef.c
@@ -387,7 +387,7 @@ static int ParOutError(SConnection * con, ParData * o)
              o->name, ctx->thisPar);
     break;
   case ILLNUM:
-    SCPrintf(con, eError, "ERROR: illegal value", o->name, ctx->valueArg);
+    SCPrintf(con, eError, "ERROR: illegal value %s", ctx->valueArg);
     break;
   case ILLARGC:
     SCPrintf(con, eError, "ERROR: illegal number of arguments for %s %s",