diff --git a/src/Network/jpg-httpd.hxx b/src/Network/jpg-httpd.hxx
index 4e143a28f..1628dff7b 100644
--- a/src/Network/jpg-httpd.hxx
+++ b/src/Network/jpg-httpd.hxx
@@ -44,6 +44,7 @@ public:
     void init(int, int);
     void destroy();
     int render();
+    void setFrustum(double,double,double,double,double,double);
   void *data();
 };
 #endif