diff --git a/types/openlayers/index.d.ts b/types/openlayers/index.d.ts
index 01d7e120f5..37cac7e65d 100644
--- a/types/openlayers/index.d.ts
+++ b/types/openlayers/index.d.ts
@@ -9,7 +9,6 @@
 //                 Yair Tawil <https://github.com/yairtawil>
 //                 Pierre Marchand <https://github.com/pierremarc>
 //                 Hauke Stieler <https://github.com/hauke96>
-//                 Jan Suleiman <https://github.com/jansule>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // Definitions partially generated using tsd-jsdoc (https://github.com/englercj/tsd-jsdoc)
 
diff --git a/types/openlayers/openlayers-tests.ts b/types/openlayers/openlayers-tests.ts
index 240f77d033..6e28ad4cd2 100644
--- a/types/openlayers/openlayers-tests.ts
+++ b/types/openlayers/openlayers-tests.ts
@@ -1133,13 +1133,13 @@ styleStroke.setLineDashOffset(10);
 styleStroke.setMiterLimit(20);
 styleStroke.setWidth(5);
 
-styleStroke.getColor();
-styleStroke.getLineCap();
-styleStroke.getLineJoin();
-styleStroke.getLineDash();
-styleStroke.getLineDashOffset();
-styleStroke.getMiterLimit();
-styleStroke.getWidth();
+const strokeColor: ol.Color|ol.ColorLike = styleStroke.getColor();
+const strokeLineCap: string = styleStroke.getLineCap();
+const strokeLineJoin: string = styleStroke.getLineJoin();
+const strokeLineDash: number[] = styleStroke.getLineDash();
+const strokeLineDashOffset: number = styleStroke.getLineDashOffset();
+const strokeMiterLimit: number = styleStroke.getMiterLimit();
+const strokeWidth: number = styleStroke.getWidth();
 
 //
 // ol.proj