diff --git a/cmd/cu/terminal.go b/cmd/cu/terminal.go
index 37db660c..ca18f9d2 100644
--- a/cmd/cu/terminal.go
+++ b/cmd/cu/terminal.go
@@ -36,7 +36,7 @@ var terminalCmd = &cobra.Command{
 				}
 				return fmt.Errorf("failed to look up dagger binary: %w", err)
 			}
-			return syscall.Exec(daggerBin, append([]string{"dagger", "run"}, os.Args...), os.Environ())
+			return syscall.Exec(daggerBin, append([]string{"dagger", "run"}, os.Args...), append(os.Environ(), "DAGGER_LEAVE_OLD_ENGINE=1"))
 		}
 
 		dag, err := dagger.Connect(ctx, dagger.WithLogOutput(os.Stderr))