diff --git a/modules/gui/include/visp3/gui/vpDisplayFactory.h b/modules/gui/include/visp3/gui/vpDisplayFactory.h
index 39716f30b6..6d672353c4 100644
--- a/modules/gui/include/visp3/gui/vpDisplayFactory.h
+++ b/modules/gui/include/visp3/gui/vpDisplayFactory.h
@@ -71,7 +71,6 @@ vpDisplay *displayFactory()
   return new vpDisplayOpenCV();
 #endif
 #else
-  (void)I;
   return nullptr;
 #endif
 }