diff --git a/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java b/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
index 38660d3a2..268bbe0cc 100644
--- a/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
+++ b/src/main/java/de/neemann/digital/fsm/gui/FSMFrame.java
@@ -348,7 +348,7 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
             public void actionPerformed(ActionEvent e) {
                 fsmComponent.scaleCircuit(1 / 0.9);
             }
-        }.setAccelerator("control PLUS");
+        }.setAcceleratorCTRLplus("PLUS");
         // enable [+] which is SHIFT+[=] on english keyboard layout
         fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_EQUALS, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
         fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ADD, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
@@ -359,7 +359,7 @@ public class FSMFrame extends JFrame implements ClosingWindowListener.ConfirmSav
             public void actionPerformed(ActionEvent e) {
                 fsmComponent.scaleCircuit(0.9);
             }
-        }.setAccelerator("control MINUS");
+        }.setAcceleratorCTRLplus("MINUS");
         // enable [+] which is SHIFT+[=] on english keyboard layout
         fsmComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SUBTRACT, KeyEvent.CTRL_DOWN_MASK, false), zoomOut);
         fsmComponent.getActionMap().put(zoomOut, zoomOut);
diff --git a/src/main/java/de/neemann/digital/gui/Main.java b/src/main/java/de/neemann/digital/gui/Main.java
index 01b490f18..ad717b6b0 100644
--- a/src/main/java/de/neemann/digital/gui/Main.java
+++ b/src/main/java/de/neemann/digital/gui/Main.java
@@ -352,7 +352,7 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             public void actionPerformed(ActionEvent e) {
                 circuitComponent.scaleCircuit(1 / 0.9);
             }
-        }.setAccelerator("control PLUS");
+        }.setAcceleratorCTRLplus("PLUS");
         // enable [+] which is SHIFT+[=] on english keyboard layout
         circuitComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_EQUALS, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
         circuitComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ADD, KeyEvent.CTRL_DOWN_MASK, false), zoomIn);
@@ -363,7 +363,7 @@ public final class Main extends JFrame implements ClosingWindowListener.ConfirmS
             public void actionPerformed(ActionEvent e) {
                 circuitComponent.scaleCircuit(0.9);
             }
-        }.setAccelerator("control MINUS");
+        }.setAcceleratorCTRLplus("MINUS");
         // enable [+] which is SHIFT+[=] on english keyboard layout
         circuitComponent.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SUBTRACT, KeyEvent.CTRL_DOWN_MASK, false), zoomOut);
         circuitComponent.getActionMap().put(zoomOut, zoomOut);
diff --git a/src/main/java/de/neemann/digital/gui/components/data/GraphDialog.java b/src/main/java/de/neemann/digital/gui/components/data/GraphDialog.java
index 0ef3e2096..aa392df38 100644
--- a/src/main/java/de/neemann/digital/gui/components/data/GraphDialog.java
+++ b/src/main/java/de/neemann/digital/gui/components/data/GraphDialog.java
@@ -129,13 +129,13 @@ public class GraphDialog extends JDialog implements Observer {
             public void actionPerformed(ActionEvent e) {
                 graphComponent.scale(1.25f, getWidth() / 2);
             }
-        }.setAccelerator("control PLUS");
+        }.setAcceleratorCTRLplus("PLUS");
         ToolTipAction zoomOut = new ToolTipAction(Lang.get("menu_zoomOut"), ICON_ZOOM_OUT) {
             @Override
             public void actionPerformed(ActionEvent e) {
                 graphComponent.scale(0.8f, getWidth() / 2);
             }
-        }.setAccelerator("control MINUS");
+        }.setAcceleratorCTRLplus("MINUS");
 
         showTable = new ToolTipAction(Lang.get("menu_showDataAsTable")) {
             @Override
diff --git a/src/main/java/de/neemann/gui/ToolTipAction.java b/src/main/java/de/neemann/gui/ToolTipAction.java
index a48eac1f9..4f389f066 100644
--- a/src/main/java/de/neemann/gui/ToolTipAction.java
+++ b/src/main/java/de/neemann/gui/ToolTipAction.java
@@ -100,6 +100,20 @@ public abstract class ToolTipAction extends AbstractAction {
         return setAccelerator(KeyStroke.getKeyStroke(key));
     }
 
+    /**
+     * Sets an accelerator to the action
+     *
+     * @param key the accelerator key
+     * @return this for call chaining
+     */
+    public ToolTipAction setAcceleratorCTRLplus(String key) {
+        int mask = KeyEvent.CTRL_DOWN_MASK;
+        if (Screen.isMac())
+            mask= KeyEvent.META_DOWN_MASK;
+        int keyCode = KeyStroke.getKeyStroke(key).getKeyCode();
+        return setAccelerator(KeyStroke.getKeyStroke(keyCode, mask));
+    }
+
     /**
      * Sets an accelerator to the action
      *