diff --git a/ui/qt/widgets/rtp_audio_graph.cpp b/ui/qt/widgets/rtp_audio_graph.cpp
index fe88236c6f..1340658b38 100644
--- a/ui/qt/widgets/rtp_audio_graph.cpp
+++ b/ui/qt/widgets/rtp_audio_graph.cpp
@@ -16,7 +16,7 @@
 
 static const double wf_graph_normal_width_ = 0.5;
 
-RtpAudioGraph::RtpAudioGraph(QCustomPlot *audio_plot, QRgb color)
+RtpAudioGraph::RtpAudioGraph(QCustomPlot *audio_plot, QRgb color) : QObject(audio_plot)
 {
     QPen p;
     QPalette sel_pal;