diff --git a/src/Python/SIP/Bindings.cpp b/src/Python/SIP/Bindings.cpp
index 0c65f2c55a..3cd6339fd2 100644
--- a/src/Python/SIP/Bindings.cpp
+++ b/src/Python/SIP/Bindings.cpp
@@ -120,6 +120,8 @@ Bindings::addAnnotation(QString, QString s1, QString s2, double)
     QStringList labels;
     labels << s2;
     python->chart->emitAnnotation(s1, labels);
+
+    return true;
 }
 
 void