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-rw-r--r--src/ui/widget/spin-slider.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ui/widget/spin-slider.h b/src/ui/widget/spin-slider.h
index cd2d2a427..fe03c85d3 100644
--- a/src/ui/widget/spin-slider.h
+++ b/src/ui/widget/spin-slider.h
@@ -32,7 +32,7 @@ class SpinSlider : public Gtk::HBox, public AttrWidget
{
public:
SpinSlider(double value, double lower, double upper, double step_inc,
- double climb_rate, int digits, const SPAttributeEnum a = SP_ATTR_INVALID, const char* tip_text = NULL);
+ double climb_rate, int digits, const SPAttributeEnum a = SP_ATTR_INVALID, const char* tip_text = nullptr);
Glib::ustring get_as_attribute() const override;
void set_from_attribute(SPObject*) override;