diff --git a/lib/mixins/property-effects.html b/lib/mixins/property-effects.html
index 216b21b19f..3ed29d7f03 100644
--- a/lib/mixins/property-effects.html
+++ b/lib/mixins/property-effects.html
@@ -2054,7 +2054,7 @@
         let attr = CaseMap.camelToDashCase(property);
         if (attr[0] === '-') {
           console.warn('Property ' + property + ' cannot be reflected to attribute ' +
-            attr + ' because "-" is not a valid starting attribute name. Use a lowercase first letter for the property thisead.');
+            attr + ' because "-" is not a valid starting attribute name. Use a lowercase first letter for the property instead.');
         } else {
           this._addPropertyEffect(property, TYPES.REFLECT, {
             fn: runReflectEffect,