diff --git a/examples/earthquake-clusters.css b/examples/earthquake-clusters.css
index a73813d649..1c2ae6286d 100644
--- a/examples/earthquake-clusters.css
+++ b/examples/earthquake-clusters.css
@@ -9,7 +9,6 @@
 }
 .tooltip.in {
   opacity: 1;
-  filter: alpha(opacity=100);
 }
 .tooltip.top .tooltip-arrow {
   border-top-color: white;
diff --git a/examples/kml-earthquakes.css b/examples/kml-earthquakes.css
index a73813d649..1c2ae6286d 100644
--- a/examples/kml-earthquakes.css
+++ b/examples/kml-earthquakes.css
@@ -9,7 +9,6 @@
 }
 .tooltip.in {
   opacity: 1;
-  filter: alpha(opacity=100);
 }
 .tooltip.top .tooltip-arrow {
   border-top-color: white;