diff --git a/d3.cloud.layout/d3.cloud.layout-tests.ts b/d3.cloud.layout/d3.cloud.layout-tests.ts
index c22d76b361..9d5ed7b718 100644
--- a/d3.cloud.layout/d3.cloud.layout-tests.ts
+++ b/d3.cloud.layout/d3.cloud.layout-tests.ts
@@ -10,7 +10,7 @@
   }
 
 
-  var fill = d3.scale.category20();
+  var fill = d3.scale.category20<number>();
   d3.layout.cloud().size([300, 300])
       .words([
         "Hello", "world", "normally", "you", "want", "more", "words",
@@ -40,4 +40,4 @@
           return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
         })
         .text(function(d:ICompTextSize) { return d.text; });
-  }
\ No newline at end of file
+  }