diff --git a/toolkit/content/widgets/findbar.xml b/toolkit/content/widgets/findbar.xml
index 782a392b8554..f8441a642be2 100644
--- a/toolkit/content/widgets/findbar.xml
+++ b/toolkit/content/widgets/findbar.xml
@@ -238,7 +238,7 @@
                          label="&highlight.label;"
                          accesskey="&highlight.accesskey;"
                          tooltiptext="&highlight.tooltiptext;"
-                         oncommand="toggleHighlight(!this.checked);"
+                         oncommand="toggleHighlight(this.checked);"
                          type="checkbox"
                          disabled="true"
                          xbl:inherits="accesskey=highlightaccesskey"/>