diff --git a/chrome/content/zotero/bindings/itembox.xml b/chrome/content/zotero/bindings/itembox.xml
index e5dd2980f..285203fa4 100644
--- a/chrome/content/zotero/bindings/itembox.xml
+++ b/chrome/content/zotero/bindings/itembox.xml
@@ -1453,6 +1453,7 @@
 							t.setAttribute(
 								'autocompletesearchparam', JSON.stringify(params)
 							);
+							t.setAttribute('completeselectedindex', true);
 						}
 					}
 					var box = elem.parentNode;
diff --git a/chrome/content/zotero/bindings/tagsbox.xml b/chrome/content/zotero/bindings/tagsbox.xml
index bd4bf15c6..d55c5781a 100644
--- a/chrome/content/zotero/bindings/tagsbox.xml
+++ b/chrome/content/zotero/bindings/tagsbox.xml
@@ -445,6 +445,7 @@
 						t.setAttribute(
 							'autocompletesearchparam', JSON.stringify(params)
 						);
+						t.setAttribute('completeselectedindex', true);
 					}
 					
 					var box = elem.parentNode;