diff --git a/chrome/content/zotero/preferences/preferences_cite.xul b/chrome/content/zotero/preferences/preferences_cite.xul
index 233d0d91a..3a9105c54 100644
--- a/chrome/content/zotero/preferences/preferences_cite.xul
+++ b/chrome/content/zotero/preferences/preferences_cite.xul
@@ -61,8 +61,9 @@
 							<label class="zotero-text-link"
 									value="&zotero.preferences.export.getAdditionalStyles;" flex="1"
 									onclick="Zotero_Preferences.Cite.openStylesPage(); event.preventDefault()"/>
-							<button disabled="true" id="styleManager-delete" label="-" onclick="Zotero_Preferences.Cite.deleteStyle()"/>
-							<button label="+" onclick="Zotero_Preferences.Cite.addStyle()"/>
+							<button disabled="true" id="styleManager-delete" label="-"
+								oncommand="Zotero_Preferences.Cite.deleteStyle()"/>
+							<button label="+" oncommand="Zotero_Preferences.Cite.addStyle()"/>
 						</hbox>
 					</groupbox>