--- Convert-BER-XS/XS.xs	2019/04/23 21:03:12	1.31
+++ Convert-BER-XS/XS.xs	2019/04/23 21:20:25	1.32
@@ -290,7 +290,7 @@
       // that a slightly inefficient get_length won't matter.
 
       if (expect_false (cnt == 0))
-        error ("indefinite BER value lengths not supported");
+        error ("illegal use of indefinite BER length form in primitive encoding (X.690 8.1.3.2)");
 
       if (expect_false (cnt > UVSIZE))
         error ("BER value length too long (must fit into UV) or BER reserved value in length (X.690 8.1.3.5)");