diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 287ddb8f6b2..1cb2c2c54be 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2007-04-17  Anatoly Sokolov <aesok@post.ru>
+
+	PR target/30483
+	* config/avr/avr.c (ptrreg_to_str): Replace gcc_unreachable() with
+	error().
+
 2007-04-17  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/i386/sse.md (sse_vmaddv4sf3): Use register_operand
diff --git a/gcc/config/avr/avr.c b/gcc/config/avr/avr.c
index 3980ca98d47..33938ea51f5 100644
--- a/gcc/config/avr/avr.c
+++ b/gcc/config/avr/avr.c
@@ -1041,7 +1041,7 @@ ptrreg_to_str (int regno)
     case REG_Y: return "Y";
     case REG_Z: return "Z";
     default:
-      gcc_unreachable ();
+      error ("address operand requires constraint for X, Y, or Z register");
     }
   return NULL;
 }