diff --git a/lib/OpenLayers/Format/SLD/v1.js b/lib/OpenLayers/Format/SLD/v1.js
index 13fb9dba81..459498af2b 100644
--- a/lib/OpenLayers/Format/SLD/v1.js
+++ b/lib/OpenLayers/Format/SLD/v1.js
@@ -251,24 +251,21 @@ OpenLayers.Format.SLD.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
                 graphic.graphicName = this.getChildValue(node);
             },
             "Opacity": function(node, obj) {
-                // No support for parsing of OGC expressions
-                var opacity = this.getChildValue(node);
+                var opacity = this.readOgcExpression(node);
                 // always string, could be empty string
                 if(opacity) {
                     obj.opacity = opacity;
                 }
             },
             "Size": function(node, obj) {
-                // No support for parsing of OGC expressions
-                var size = this.getChildValue(node);
+                var size = this.readOgcExpression(node);
                 // always string, could be empty string
                 if(size) {
                     obj.size = size;
                 }
             },
             "Rotation": function(node, obj) {
-                // No support for parsing of OGC expressions
-                var rotation = this.getChildValue(node);
+                var rotation = this.readOgcExpression(node);
                 // always string, could be empty string
                 if(rotation) {
                     obj.rotation = rotation;