diff --git a/ChangeLog b/ChangeLog
index 9f2bf0f4e..4195f7c49 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2005-01-12  Mike Kestner  <mkestner@novell.com>
+
+	* sources/MethodBody.cs : use Utf8.GetByteCount for hidden len params.
+	[Fixes #77097]
+
 2005-01-11  Mike Kestner  <mkestner@novell.com>
 
 	* bootstrap-2.8 : bump version to 2.8.0
diff --git a/generator/MethodBody.cs b/generator/MethodBody.cs
index 021dd3f1b..bb0ca689e 100644
--- a/generator/MethodBody.cs
+++ b/generator/MethodBody.cs
@@ -71,7 +71,7 @@ namespace GtkSharp.Generation {
 					}
 				} else if (i > 0 && parameters [i - 1].IsString && p.IsLength) {
 					string string_name = (i == 1 && is_set) ? "value" : parameters [i - 1].Name;
-					result[i] = igen.CallByName (CastFromInt (p.CSType) + string_name + ".Length");
+					result[i] = igen.CallByName (CastFromInt (p.CSType) + "System.Text.Encoding.UTF8.GetByteCount (" +  string_name + ")");
 					continue;
 				} else if (p.IsArray && p.MarshalType != p.CSType) {
 					result[i] = "native_" + p.Name;