diff --git a/include/wble/DoubleSlider.h b/include/wble/DoubleSlider.h
index 4bb8436..e05c9e0 100644
--- a/include/wble/DoubleSlider.h
+++ b/include/wble/DoubleSlider.h
@@ -14,7 +14,8 @@ class WBLE_EXPORT DoubleSlider : public QSlider
     /// @param min Minimum value of slider.
     /// @param max Maximum value of slider.
     /// @param parent Parent widget.
-    DoubleSlider(double min, double max, QWidget* parent = nullptr);
+    DoubleSlider(double min, double max, QWidget* parent);
+    DoubleSlider(double min, double max);
 
     /// Get slider minimum value.
     /// @return Slider minimum value.
diff --git a/include/wble/FilterNumbers.h b/include/wble/FilterNumbers.h
index ed366f9..6243308 100644
--- a/include/wble/FilterNumbers.h
+++ b/include/wble/FilterNumbers.h
@@ -21,8 +21,8 @@ class WBLE_EXPORT FilterNumbers : public Filter
 {
     Q_OBJECT
 public:
-    FilterNumbers(const QString& name, double from, double to,
-                  QWidget* parent = nullptr);
+    FilterNumbers(const QString& name, double from, double to, QWidget* parent);
+    FilterNumbers(const QString& name, double from, double to);
 
     ~FilterNumbers() override;
 
diff --git a/src/DoubleSlider.cpp b/src/DoubleSlider.cpp
index a4a394b..8178563 100644
--- a/src/DoubleSlider.cpp
+++ b/src/DoubleSlider.cpp
@@ -30,6 +30,11 @@ DoubleSlider::DoubleSlider(double min, double max, QWidget* parent)
     setHandleRect();
 }
 
+DoubleSlider::DoubleSlider(double min, double max)
+    : DoubleSlider(min, max, nullptr)
+{
+}
+
 double DoubleSlider::getCurrentMin() const { return currentMin_; }
 
 double DoubleSlider::getCurrentMax() const { return currentMax_; }
diff --git a/src/FilterNumbers.cpp b/src/FilterNumbers.cpp
index e2f47aa..179597f 100644
--- a/src/FilterNumbers.cpp
+++ b/src/FilterNumbers.cpp
@@ -29,6 +29,11 @@ FilterNumbers::FilterNumbers(const QString& name, double from, double to,
         setDisabled(true);
 }
 
+FilterNumbers::FilterNumbers(const QString& name, double from, double to)
+    : FilterNumbers(name, from, to, nullptr)
+{
+}
+
 FilterNumbers::~FilterNumbers() = default;
 
 void FilterNumbers::checkedStateChanged(bool checked)
@@ -54,10 +59,7 @@ void FilterNumbers::changeEvent(QEvent* event)
         initColorForLineEdits();
 }
 
-int FilterNumbers::getDecimalPlaces() const
-{
-    return decimalPlaces_;
-}
+int FilterNumbers::getDecimalPlaces() const { return decimalPlaces_; }
 
 void FilterNumbers::initDoubleSlider()
 {