diff --git a/3d-viewer/3d_cache/dialogs/dialog_select_3dmodel.h b/3d-viewer/3d_cache/dialogs/dialog_select_3dmodel.h
index 156e8235f1..46f4ffd968 100644
--- a/3d-viewer/3d_cache/dialogs/dialog_select_3dmodel.h
+++ b/3d-viewer/3d_cache/dialogs/dialog_select_3dmodel.h
@@ -33,7 +33,7 @@
 #include <wx/filedlg.h>
 
 class S3D_CACHE;
-class S3D_INFO;
+struct S3D_INFO;
 
 class DLG_SEL_3DMODEL : public wxFileDialog
 {