Is it possible to use arrow keys alone to expand tree node in package explorer in Eclipse on Linux?

When using Eclipse I browse through the package explorer tree using the keyboard arrows a lot. In Windows I can expand a collapsed node by pressing the <kbd>→</kbd> key. In Linux I need to press <kbd>Shift</kbd> + <kbd>→</kbd>. Is there a way to reconfigure this so that <kbd>Shift</kbd> is not required?