diff --git a/src/common/bspf.hxx b/src/common/bspf.hxx
index 84164a087..a26d9f5a3 100644
--- a/src/common/bspf.hxx
+++ b/src/common/bspf.hxx
@@ -76,6 +76,7 @@ using std::memcpy;
 
 // Common array types
 using IntArray = std::vector<Int32>;
+using uIntArray = std::vector<uInt32>;
 using BoolArray = std::vector<bool>;
 using ByteArray = std::vector<uInt8>;
 using ShortArray = std::vector<uInt16>;
diff --git a/src/gui/TimeLineWidget.cxx b/src/gui/TimeLineWidget.cxx
index b79496561..25b8bdf0e 100644
--- a/src/gui/TimeLineWidget.cxx
+++ b/src/gui/TimeLineWidget.cxx
@@ -28,11 +28,11 @@
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 TimeLineWidget::TimeLineWidget(GuiObject* boss, const GUI::Font& font,
                                int x, int y, int w, int h,
-                               const string& label, int labelWidth, int cmd)
+                               const string& label, uInt32 labelWidth, int cmd)
   : ButtonWidget(boss, font, x, y, w, h, label, cmd),
     _value(0),
     _valueMin(0),
-    _valueMax(100),
+    _valueMax(0),
     _isDragging(false),
     _labelWidth(labelWidth)
 {
@@ -45,14 +45,13 @@ TimeLineWidget::TimeLineWidget(GuiObject* boss, const GUI::Font& font,
 
   _w = w + _labelWidth;
 
-  _stepValue.reserve(_valueMax);
+  _stepValue.reserve(100);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void TimeLineWidget::setValue(int value)
+void TimeLineWidget::setValue(uInt32 value)
 {
-  if(value < _valueMin)      value = _valueMin;
-  else if(value > _valueMax) value = _valueMax;
+  value = BSPF::clamp(value, _valueMin, _valueMax);
 
   if(value != _value)
   {
@@ -63,13 +62,13 @@ void TimeLineWidget::setValue(int value)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void TimeLineWidget::setMinValue(int value)
+void TimeLineWidget::setMinValue(uInt32 value)
 {
   _valueMin = value;
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void TimeLineWidget::setMaxValue(int value)
+void TimeLineWidget::setMaxValue(uInt32 value)
 {
   _valueMax = value;
 }
@@ -129,9 +128,9 @@ void TimeLineWidget::handleMouseWheel(int x, int y, int direction)
 {
   if(isEnabled())
   {
-    if(direction < 0)
+    if(direction < 0 && _value < _valueMax)
       setValue(_value + 1);
-    else if(direction > 0)
+    else if(direction > 0 && _value > _valueMin)
       setValue(_value - 1);
   }
 }
@@ -186,16 +185,13 @@ void TimeLineWidget::drawWidget(bool hilite)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-int TimeLineWidget::valueToPos(int value)
+uInt32 TimeLineWidget::valueToPos(uInt32 value)
 {
-  if(_valueMax >= 0)
-    return _stepValue[BSPF::clamp(value, _valueMin, _valueMax)];
-  else
-    return 0;
+  return _stepValue[BSPF::clamp(value, _valueMin, _valueMax)];
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-int TimeLineWidget::posToValue(int pos)
+uInt32 TimeLineWidget::posToValue(uInt32 pos)
 {
   // Find the interval in which 'pos' falls, and then the endpoint which
   // it is closest to
diff --git a/src/gui/TimeLineWidget.hxx b/src/gui/TimeLineWidget.hxx
index 4348452a3..3a60c1c06 100644
--- a/src/gui/TimeLineWidget.hxx
+++ b/src/gui/TimeLineWidget.hxx
@@ -25,15 +25,15 @@ class TimeLineWidget : public ButtonWidget
   public:
     TimeLineWidget(GuiObject* boss, const GUI::Font& font,
                    int x, int y, int w, int h, const string& label = "",
-                   int labelWidth = 0, int cmd = 0);
+                   uInt32 labelWidth = 0, int cmd = 0);
 
-    void setValue(int value);
-    int getValue() const      { return _value; }
+    void setValue(uInt32 value);
+    uInt32 getValue() const      { return _value; }
 
-    void setMinValue(int value);
-    int  getMinValue() const      { return _valueMin; }
-    void setMaxValue(int value);
-    int  getMaxValue() const      { return _valueMax; }
+    void setMinValue(uInt32 value);
+    uInt32  getMinValue() const      { return _valueMin; }
+    void setMaxValue(uInt32 value);
+    uInt32  getMaxValue() const      { return _valueMax; }
 
     /**
       Steps are not necessarily linear in a timeline, so we need info
@@ -49,16 +49,16 @@ class TimeLineWidget : public ButtonWidget
 
     void drawWidget(bool hilite) override;
 
-    int valueToPos(int value);
-    int posToValue(int pos);
+    uInt32 valueToPos(uInt32 value);
+    uInt32 posToValue(uInt32 pos);
 
   protected:
-    int  _value;
-    int  _valueMin, _valueMax;
-    bool _isDragging;
-    int  _labelWidth;
+    uInt32  _value;
+    uInt32  _valueMin, _valueMax;
+    bool    _isDragging;
+    uInt32  _labelWidth;
 
-    IntArray _stepValue;
+    uIntArray _stepValue;
 
   private:
     // Following constructors and assignment operators not supported
diff --git a/src/gui/TimeMachineDialog.cxx b/src/gui/TimeMachineDialog.cxx
index be386dea1..d00499770 100644
--- a/src/gui/TimeMachineDialog.cxx
+++ b/src/gui/TimeMachineDialog.cxx
@@ -212,7 +212,7 @@ void TimeMachineDialog::loadConfig()
   IntArray cycles = r.cyclesList();
 
   // Set range and intervals for timeline
-  myTimeline->setMaxValue(int(cycles.size()) - 1);
+  myTimeline->setMaxValue(cycles.size() > 1 ? cycles.size() - 1 : 0);
   myTimeline->setStepValues(cycles);
 
   // Enable blending (only once is necessary)