diff --git a/src/main/java/de/neemann/digital/gui/Main.java b/src/main/java/de/neemann/digital/gui/Main.java
index ab2ab7ead..c7ab8a6bb 100644
--- a/src/main/java/de/neemann/digital/gui/Main.java
+++ b/src/main/java/de/neemann/digital/gui/Main.java
@@ -654,7 +654,7 @@ public class Main extends JFrame implements ClosingWindowListener.ConfirmSave, E
                     Model model = new ModelCreator(circuitComponent.getCircuit(), library).createModel(false);
 
                     SpeedTest speedTest = new SpeedTest(model);
-                    double frequency = speedTest.calculate();
+                    int frequency = speedTest.calculate() / 1000;
                     circuitComponent.getCircuit().clearState();
                     JOptionPane.showMessageDialog(Main.this, Lang.get("msg_frequency_N", frequency));
                 } catch (Exception e1) {
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index 00a2beb07..b421e4672 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -735,7 +735,7 @@ Die Icons stammen aus dem Tango Desktop Project.</string>
     <string name="msg_remoteUnknownCommand">Das Kommando {0} ist unbekannt!</string>
     <string name="msg_errorWritingFile">Fehler beim Schreiben einer Datei</string>
     <string name="msg_fastRunError">Ein Fehler beim schnellen Lauf</string>
-    <string name="msg_frequency_N">Die maximale Frequenz berägt {0}Hz.</string>
+    <string name="msg_frequency_N">Die maximale Frequenz berägt {0}kHz.</string>
     <string name="msg_missingShape_N">Es fehlt ein Diagramm für {0}</string>
     <string name="msg_pins">Pinbelegung</string>
     <string name="msg_pinMap_pin_N_is_N">Pin {0}: {1}</string>
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index 933e0e256..3745077da 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -721,7 +721,7 @@ The icons are taken from the Tango Desktop Project.</string>
     <string name="msg_errorReadingFile">Error reading a file</string>
     <string name="msg_errorWritingFile">Error writing a file</string>
     <string name="msg_fastRunError">Error at fast run</string>
-    <string name="msg_frequency_N">The maximum frequency is {0}Hz</string>
+    <string name="msg_frequency_N">The maximum frequency is {0}kHz</string>
     <string name="msg_missingShape_N">Shape {0} is missing</string>
     <string name="msg_pins">Pin assignment</string>
     <string name="msg_pinMap_pin_N_is_N">Pin {0}: {1}</string>