--- a/layout/reftests/details-summary/reftest.list
+++ b/layout/reftests/details-summary/reftest.list
@@ -90,17 +90,17 @@ fuzzy-if(gtkWidget,1,20) == mouse-click-
 == mouse-click-change-details-to-display-none.html open-single-summary.html
 == mouse-click-change-summary-to-display-none.html mouse-click-change-summary-to-display-none-ref.html
 == mouse-click-move-summary-to-different-details.html mouse-click-move-summary-to-different-details-ref.html
 
 # Dispatch mouse click to out-of-flow details or summary
 == mouse-click-fixed-summary.html open-fixed-summary.html
 == mouse-click-twice-fixed-summary.html fixed-summary.html
 == mouse-click-float-details.html open-float-details.html
-== mouse-click-twice-float-details.html float-details.html
+fuzzy-if(gtkWidget,1,1) == mouse-click-twice-float-details.html float-details.html #Bug 1316430
 
 # Dispatch keyboard event to summary
 == key-enter-single-summary.html open-single-summary.html
 == key-enter-open-second-summary.html open-multiple-summary.html
 == key-enter-prevent-default.html single-summary.html
 == key-space-single-summary.html open-single-summary.html
 
 # Generated content bits