diff --git a/src/main/java/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css b/src/main/java/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
index cc58fbd..adf0c77 100644
--- a/src/main/java/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
+++ b/src/main/java/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
@@ -129,7 +129,7 @@
 }
 
 @sprite .categoryItem-Expanded {
-	gwt-image: triangleDown";
+	gwt-image: "triangleDown";
 	/*"background-image: url(images/triangle-down.png);*/
 }
 
diff --git a/src/main/resources/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css b/src/main/resources/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
index cc58fbd..adf0c77 100644
--- a/src/main/resources/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
+++ b/src/main/resources/org/gcube/portlets/widgets/dataminermanagerwidget/client/resources/DataMiner.css
@@ -129,7 +129,7 @@
 }
 
 @sprite .categoryItem-Expanded {
-	gwt-image: triangleDown";
+	gwt-image: "triangleDown";
 	/*"background-image: url(images/triangle-down.png);*/
 }