diff --git a/source/frontends/qapple/emulator.cpp b/source/frontends/qapple/emulator.cpp
index 9c425f18..8028be4c 100644
--- a/source/frontends/qapple/emulator.cpp
+++ b/source/frontends/qapple/emulator.cpp
@@ -24,7 +24,7 @@ void Emulator::setVideoSize(QMdiSubWindow * window, const QSize & size)
     window->resize(size + gap);
 }
 
-void Emulator::setZoom(QMdiSubWindow * window, int x)
+void Emulator::setZoom(QMdiSubWindow * window, const int x)
 {
     const QSize target = video->minimumSize() * x;
     setVideoSize(window, target);
diff --git a/source/frontends/qapple/emulator.h b/source/frontends/qapple/emulator.h
index 7bd077ca..0641c9b0 100644
--- a/source/frontends/qapple/emulator.h
+++ b/source/frontends/qapple/emulator.h
@@ -14,7 +14,7 @@ public:
 
     void redrawScreen();
 
-    void setZoom(QMdiSubWindow * window, int x);
+    void setZoom(QMdiSubWindow * window, const int x);
     void set43AspectRatio(QMdiSubWindow * window);
 
 private:
diff --git a/source/frontends/qapple/qapple.cpp b/source/frontends/qapple/qapple.cpp
index 2da1a7e8..bffba618 100644
--- a/source/frontends/qapple/qapple.cpp
+++ b/source/frontends/qapple/qapple.cpp
@@ -167,7 +167,7 @@ void QApple::timerEvent(QTimerEvent *)
     setNextTimer(nextGap);
 }
 
-void QApple::setNextTimer(int ms)
+void QApple::setNextTimer(const int ms)
 {
     if (ms != myCurrentGap)
     {
diff --git a/source/frontends/qapple/qapple.h b/source/frontends/qapple/qapple.h
index 73a5fb4d..dfb7cdbc 100644
--- a/source/frontends/qapple/qapple.h
+++ b/source/frontends/qapple/qapple.h
@@ -29,7 +29,7 @@ private slots:
 
 private:
 
-    void setNextTimer(int ms);
+    void setNextTimer(const int ms);
 
     QMdiSubWindow * myEmulatorWindow;
     Emulator * myEmulator;