diff --git a/src/plugins/coreplugin/styleanimator.h b/src/plugins/coreplugin/styleanimator.h
index 37b25b5baf0..a16e38758d2 100644
--- a/src/plugins/coreplugin/styleanimator.h
+++ b/src/plugins/coreplugin/styleanimator.h
@@ -71,7 +71,7 @@ protected:
 class Transition : public Animation
 {
 public :
-    Transition() : Animation() {}
+    Transition() : Animation(), m_duration(100) {}
     virtual ~Transition() {}
     void setDuration(int duration) { m_duration = duration; }
     void setStartImage(const QImage &image) { m_primaryImage = image; }