--- ramap.c.~1.77.2.6.~	2004-11-26 08:44:37.000000000 +1100
+++ ramap.c	2004-12-14 10:20:16.000000000 +1100
@@ -1529,10 +1529,8 @@
 {
   SCM_VALIDATE_PROC (2,proc);
 
-  if (!(SCM_CONSP (sources) && SCM_CONSP (SCM_CDR (sources))))
-    {
-      SCM_MISC_ERROR ("At least one source array is required.", SCM_EOL);
-    }
+  if (!(SCM_CONSP (sources)))
+    SCM_WRONG_NUM_ARGS ();
 
   switch (SCM_TYP7 (proc))
     {