diff --git a/src/analyzer/sonogram.h b/src/analyzer/sonogram.h
index ecb795b4b..37f587194 100644
--- a/src/analyzer/sonogram.h
+++ b/src/analyzer/sonogram.h
@@ -32,7 +32,7 @@
 class Sonogram : public Analyzer::Base {
   Q_OBJECT
  public:
-  Q_INVOKABLE explicit Sonogram(QWidget *);
+  Q_INVOKABLE explicit Sonogram(QWidget *parent);
   ~Sonogram();
 
   static const char *kName;