diff --git a/include/mujincontrollerclient/mujincontrollerclient.h b/include/mujincontrollerclient/mujincontrollerclient.h
index 964c6446..fbdf6eb4 100644
--- a/include/mujincontrollerclient/mujincontrollerclient.h
+++ b/include/mujincontrollerclient/mujincontrollerclient.h
@@ -793,7 +793,7 @@ class MUJINCLIENT_API ObjectResource : public WebResource
         std::string geomtype;
         Real quaternion[4]; // quaternion [w, x, y, z] = [cos(angle/2), sin(angle/2)*rotation_axis]
         Real translate[3];
-        bool visible;
+        bool visible = true;
         Real diffusecolor[4];
         Real transparency;
         Real half_extents[3];