diff --git a/chrome/content/zotero/xpcom/editorInstance.js b/chrome/content/zotero/xpcom/editorInstance.js
index 74c53d6b6f..b6f8619132 100644
--- a/chrome/content/zotero/xpcom/editorInstance.js
+++ b/chrome/content/zotero/xpcom/editorInstance.js
@@ -922,7 +922,7 @@ class EditorInstance {
 	}
 
 	_formatCitation(citation) {
-		return citation.citationItems.map(x => this._formatCitationItemPreview(x)).join(';');
+		return citation.citationItems.map(x => this._formatCitationItemPreview(x)).join('; ');
 	}
 
 	_arrayBufferToBase64(buffer) {