diff --git a/wrap/io_trimesh/import_vmi.h b/wrap/io_trimesh/import_vmi.h
index 0ae7622d..784fd475 100644
--- a/wrap/io_trimesh/import_vmi.h
+++ b/wrap/io_trimesh/import_vmi.h
@@ -636,6 +636,8 @@ namespace io {
             case 0: return Read_mem(dst, size,count, f );  break;
             case 1: return fread(dst, size,count, f ); break;
              }
+            assert(0);
+            return 0;
         }