diff --git a/mixer/src/Module.C b/mixer/src/Module.C
index 56bd99a..3b6b558 100644
--- a/mixer/src/Module.C
+++ b/mixer/src/Module.C
@@ -709,6 +709,8 @@ Module::show_analysis_window ( void )
     while ( w->shown() )
         Fl::wait();
 
+    delete w;
+
     return true;
 }