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diff --git a/nixfig.go b/nixfig.go
index 91a746eb6b67841fae8929b12438850e2f93622d..8b801385489178d6c232493c5fae6031662989cc 100644
--- a/nixfig.go
+++ b/nixfig.go
@@ -46,13 +46,13 @@ 		return ErrNixNotFound
 	}
 
 	var stdout, stderr bytes.Buffer
-	cmd := exec.Command(Nix, "--extra-experimental-features", "nix-command", "eval", "--json", "--expr", string(data))
+	cmd := exec.Command(Nix, "--offline", "--extra-experimental-features", "nix-command", "eval", "--json", "--expr", string(data))
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {
 		return fmt.Errorf("could not run %q: %w", Nix, err)
 	}
-	if stderr.Len() > 0 {
+	if cmd.ProcessState.ExitCode() != 0 && stderr.Len() > 0 {
 		return errors.New(stderr.String())
 	}
 
@@ -74,13 +74,13 @@ 		return nil, fmt.Errorf("could not marshal JSON: %w", err)
 	}
 
 	var stdout, stderr bytes.Buffer
-	cmd := exec.Command(Nix, "--extra-experimental-features", "nix-command", "eval", "--expr", fmt.Sprintf(`(builtins.fromJSON %q)`, string(data)))
+	cmd := exec.Command(Nix, "--offline", "--extra-experimental-features", "nix-command", "eval", "--expr", fmt.Sprintf(`(builtins.fromJSON %q)`, string(data)))
 	cmd.Stdout = &stdout
 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {
 		return nil, fmt.Errorf("could not run %q: %w", Nix, err)
 	}
-	if stderr.Len() > 0 {
+	if cmd.ProcessState.ExitCode() != 0 && stderr.Len() > 0 {
 		return nil, errors.New(stderr.String())
 	}
 
@@ -106,7 +106,7 @@ 	cmd.Stderr = &stderr
 	if err := cmd.Run(); err != nil {
 		return nil, fmt.Errorf("could not run %v: %w", Fmt, err)
 	}
-	if stderr.Len() > 0 {
+	if cmd.ProcessState.ExitCode() != 0 && stderr.Len() > 0 {
 		return nil, errors.New(stderr.String())
 	}