diff --git a/src/objects-inl.h b/src/objects-inl.h
index bb24a2f854..b8f3bd5422 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2336,7 +2336,7 @@ String* SlicedString::parent() {
 
 
 void SlicedString::set_parent(String* parent) {
-  ASSERT(parent->IsSeqString());
+  ASSERT(parent->IsSeqString() || parent->IsExternalString());
   WRITE_FIELD(this, kParentOffset, parent);
 }
 
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index 630dfb08d0..93f7588d36 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1,4 +1,4 @@
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 
 // Check that we can traverse very deep stacks of ConsStrings using
 // StringInputBuffer.  Check that Get(int) works on very deep stacks
diff --git a/test/mjsunit/string-slices-regexp.js b/test/mjsunit/string-slices-regexp.js
index a8cadaedd5..df01574d83 100644
--- a/test/mjsunit/string-slices-regexp.js
+++ b/test/mjsunit/string-slices-regexp.js
@@ -1,4 +1,4 @@
-// Copyright 2009 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
diff --git a/test/mjsunit/string-slices.js b/test/mjsunit/string-slices.js
index 40b9a20d1c..7c40229c75 100755
--- a/test/mjsunit/string-slices.js
+++ b/test/mjsunit/string-slices.js
@@ -1,4 +1,4 @@
-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
diff --git a/tools/logreader.js b/tools/logreader.js
index 315e721276..b23add4481 100644
--- a/tools/logreader.js
+++ b/tools/logreader.js
@@ -1,4 +1,4 @@
-// Copyright 2009 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met: