diff --git a/agent/agent.go b/agent/agent.go
index ddfd2840ef8da..09a36e2e6d6a8 100644
--- a/agent/agent.go
+++ b/agent/agent.go
@@ -359,6 +359,7 @@ func (a *agent) createCommand(ctx context.Context, rawCommand string, env []stri
 	if err != nil {
 		return nil, xerrors.Errorf("getting os executable: %w", err)
 	}
+	cmd.Env = append(cmd.Env, fmt.Sprintf("USER=%s", username))
 	cmd.Env = append(cmd.Env, fmt.Sprintf(`PATH=%s%c%s`, os.Getenv("PATH"), filepath.ListSeparator, filepath.Dir(executablePath)))
 	// Git on Windows resolves with UNIX-style paths.
 	// If using backslashes, it's unable to find the executable.