diff --git a/src/core/lispStream.cc b/src/core/lispStream.cc
index 24bb1d336c..0b8ab988b7 100644
--- a/src/core/lispStream.cc
+++ b/src/core/lispStream.cc
@@ -2460,7 +2460,7 @@ cl_index FileStream_O::write_vector(T_sp data, cl_index start, cl_index end) {
     return end;
   }
 #endif
-  SIMPLE_ERROR("Unable to write_vector.");
+  return AnsiStream_O::write_vector(data, start, end);
 }
 
 SYMBOL_EXPORT_SC_(KeywordPkg, utf_8);