diff --git a/chrome/content/zotero/bindings/styled-textbox.xml b/chrome/content/zotero/bindings/styled-textbox.xml
index 9cb967fa8..8d2b59643 100644
--- a/chrome/content/zotero/bindings/styled-textbox.xml
+++ b/chrome/content/zotero/bindings/styled-textbox.xml
@@ -436,7 +436,7 @@
 										+ "body#zotero-tinymce-note.mceContentBody td, "
 										+ "body#zotero-tinymce-note.mceContentBody pre { "
 											+ "font-size: "
-											+ Zotero.Prefs.get('note.fontSize') + "px; "
+											+ Math.max(6, Zotero.Prefs.get('note.fontSize')) + "px; "
 										+ "} "
 										+ "body#zotero-tinymce-note.mceContentBody, "
 										+ "body#zotero-tinymce-note.mceContentBody p { "
diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index 1007d4e42..9a2d3e03e 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -2349,6 +2349,13 @@ Zotero.Prefs = new function(){
 				}
 				break;
 			
+			case "note.fontSize":
+				var val = this.get('note.fontSize');
+				if (val < 6) {
+					this.set('note.fontSize', 6);
+				}
+				break;
+			
 			case "zoteroDotOrgVersionHeader":
 				if (this.get("zoteroDotOrgVersionHeader")) {
 					Zotero.VersionHeader.register();