diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.cpp b/src/blackgui/components/settingssimulatorbasicscomponent.cpp
index 6bc02e25e..f2656d73f 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.cpp
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.cpp
@@ -14,6 +14,7 @@
 #include "blackmisc/logmessage.h"
 #include "blackconfig/buildconfig.h"
 
+#include <QMessageBox>
 #include <QRegularExpression>
 
 using namespace BlackMisc;
@@ -64,6 +65,13 @@ namespace BlackGui
             ui->comp_SimulatorSelector->setVisible(show);
         }
 
+        bool CSettingsSimulatorBasicsComponent::hasAnyValues() const
+        {
+            return !ui->le_SimulatorDirectory->text().isEmpty() ||
+                   !ui->pte_ModelDirectories->toPlainText().isEmpty() ||
+                   !ui->pte_ExcludeDirectories->toPlainText().isEmpty();
+        }
+
         void CSettingsSimulatorBasicsComponent::setSimulator(const CSimulatorInfo &simulator)
         {
             Q_ASSERT_X(simulator.isSingleSimulator(), Q_FUNC_INFO, "Need single simulator");
@@ -137,6 +145,13 @@ namespace BlackGui
         void CSettingsSimulatorBasicsComponent::copyDefaults()
         {
             const CSimulatorInfo simulator(ui->comp_SimulatorSelector->getValue());
+            const bool anyValues = this->hasAnyValues();
+            if (anyValues)
+            {
+                QMessageBox::StandardButton reply = QMessageBox::question(this, "Override", "Override existing values?", QMessageBox::Yes | QMessageBox::No);
+                if (reply != QMessageBox::Yes) { return; }
+            }
+
             const QString sd(m_settings.defaultSimulatorDirectory(simulator));
             ui->le_SimulatorDirectory->setText(CFileUtils::normalizeFilePathToQtStandard(sd));
             const QStringList md(m_settings.defaultModelDirectories(simulator));
diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.h b/src/blackgui/components/settingssimulatorbasicscomponent.h
index dbdc97881..229265fe5 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.h
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.h
@@ -46,6 +46,9 @@ namespace BlackGui
             //! Show / hide selector
             void hideSelector(bool show);
 
+            //! Any values filled in
+            bool hasAnyValues() const;
+
             //! Simulator
             void setSimulator(const BlackMisc::Simulation::CSimulatorInfo &simulator);
 
diff --git a/src/blackgui/components/settingssimulatorbasicscomponent.ui b/src/blackgui/components/settingssimulatorbasicscomponent.ui
index 1671b73db..736b15472 100644
--- a/src/blackgui/components/settingssimulatorbasicscomponent.ui
+++ b/src/blackgui/components/settingssimulatorbasicscomponent.ui
@@ -126,7 +126,7 @@
       <string>copy (materialize) defaults</string>
      </property>
      <property name="text">
-      <string> copy def. </string>
+      <string>copy def.</string>
      </property>
     </widget>
    </item>