--- src/gui_impl/commands/zoom_gui_command.h
+++ src/gui_impl/commands/zoom_gui_command.h
@@ -57,8 +57,8 @@
     //-------------------------------------------------------------------------
     float32 minPixelPerSample ();

-    static float const ZOOM_FACTOR_ = 2;
-    static float const MAX_HORIZONTAL_ZOOM_IN_ = 32;
+    static int const ZOOM_FACTOR_ = 2;
+    static int const MAX_HORIZONTAL_ZOOM_IN_ = 32;

     static QString const GOTO_;
     static QString const ZOOM_IN_VERTICAL_;