diff --git a/ChangeLog b/ChangeLog
index 386b77764..b67003260 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2002-07-24  Mike Kestner <mkestner@speakeasy.net>
+
+	* generator/SignalHandler.cs : use ref parameters in signal cb's.
+
 2002-07-24  Alp Toker <alp@atoker.com>
 
 	* gtk/Makefile.in etc. : reference the newly compiled assemblies
diff --git a/generator/SignalHandler.cs b/generator/SignalHandler.cs
index 2d018f555..5e6c50d8a 100644
--- a/generator/SignalHandler.cs
+++ b/generator/SignalHandler.cs
@@ -65,6 +65,9 @@ namespace GtkSharp.Generation {
 				if (pcnt > 0) {
 					pinv += ", ";
 				}
+
+				if (SymbolTable.IsStruct(type))
+					pinv += "ref ";
 				pinv += (ptype + " arg" + pcnt);
 				parms.Add(type);
 				if (SymbolTable.IsObject(type)) {