diff --git a/chrome/content/zotero/bindings/styled-textbox.xml b/chrome/content/zotero/bindings/styled-textbox.xml
index cdee934aa..c549e5d94 100644
--- a/chrome/content/zotero/bindings/styled-textbox.xml
+++ b/chrome/content/zotero/bindings/styled-textbox.xml
@@ -251,6 +251,11 @@
 						return ;
 					}
 					
+					if (this.value == val) {
+						Zotero.debug("Textbox value hasn't changed");
+						return;
+					}
+					
 					var html = val;
 					if(this._format == "RTF") {
 						var bodyStyle = "";