diff --git a/src/core/core.js b/src/core/core.js
index 8c4bda98e..c891d7f35 100755
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -91,6 +91,7 @@
 			defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
 			defaultFontSize: 12,
 			defaultFontStyle: 'normal',
+			showLines: true,
 
 			// Element defaults defined in element extensions
 			elements: {},