--- src/sdloutput.c.orig	2003-12-14 00:42:15.000000000 +0100
+++ src/sdloutput.c.orig	2003-12-14 00:42:22.000000000 +0100
@@ -239,6 +239,10 @@ 
         if( event.type == SDL_MOUSEBUTTONDOWN ) {
             input_callback( in, I_BUTTONPRESS, event.button.button );
         }
+
+        if( event.type == SDL_MOUSEBUTTONUP ) {
+            input_callback( in, I_BUTTONRELEASE, event.button.button );
+        }
     }
 }