diff --git a/types/color/color-tests.ts b/types/color/color-tests.ts
index fb561d4ad1..7b1a48a945 100644
--- a/types/color/color-tests.ts
+++ b/types/color/color-tests.ts
@@ -59,3 +59,4 @@ var chain: Color.Color = color
     .opaquer(0)
     .rotate(0)
     .mix(colorOther, 0)
+    .hsl();
diff --git a/types/color/index.d.ts b/types/color/index.d.ts
index 0b7b505c01..e7e460f62a 100644
--- a/types/color/index.d.ts
+++ b/types/color/index.d.ts
@@ -85,6 +85,7 @@ declare namespace Color {
         opaquer(value: number): Color;
         rotate(value: number): Color;
         mix(color: Color, value?: number): Color;
+        hsl(): Color;
     }
 }