diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 52eac555d5..03b16fdd02 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2011-02-14  Pedro Alves  <pedro@codesourcery.com>
+	    Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* value.c (mark_value_bytes_unavailable): Fix indexing the `bef'
+	range.
+
 2011-02-14  Pedro Alves  <pedro@codesourcery.com>
 
 	* value.c (value_bits_valid, value_bits_synthetic_pointer):
diff --git a/gdb/value.c b/gdb/value.c
index 2b8dd360ab..116eee269d 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -439,7 +439,7 @@ mark_value_bytes_unavailable (struct value *value, int offset, int length)
   i = VEC_lower_bound (range_s, value->unavailable, &newr, range_lessthan);
   if (i > 0)
     {
-      struct range *bef = VEC_index (range_s, value->unavailable, i - i);
+      struct range *bef = VEC_index (range_s, value->unavailable, i - 1);
 
       if (ranges_overlap (bef->offset, bef->length, offset, length))
 	{