diff --git a/types/openlayers/index.d.ts b/types/openlayers/index.d.ts
index 37cac7e65d..3214bad15c 100644
--- a/types/openlayers/index.d.ts
+++ b/types/openlayers/index.d.ts
@@ -9,6 +9,7 @@
 //                 Yair Tawil <https://github.com/yairtawil>
 //                 Pierre Marchand <https://github.com/pierremarc>
 //                 Hauke Stieler <https://github.com/hauke96>
+//                 Guillaume Beraudo <https://github.com/gberaudo>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // Definitions partially generated using tsd-jsdoc (https://github.com/englercj/tsd-jsdoc)
 
@@ -1715,7 +1716,7 @@ export class Feature extends Object {
      * representing the current style of this feature.
      * @api stable
      */
-    getStyleFunction(): (ol.FeatureStyleFunction);
+    getStyleFunction(): (ol.FeatureStyleFunction | undefined);
 
     /**
      * Set the default geometry for the feature.  This will update the property
@@ -6412,7 +6413,7 @@ export namespace layer {
          * @return Layer style function.
          * @api stable
          */
-        getStyleFunction(): (ol.StyleFunction);
+        getStyleFunction(): (ol.StyleFunction | undefined);
 
         /**
          * Set the style for features.  This can be a single style object, an array
@@ -6424,7 +6425,7 @@ export namespace layer {
          * @param style Layer style.
          * @api stable
          */
-        setStyle(style: (ol.style.Style | ol.style.Style[] | ol.StyleFunction | null)): void;
+        setStyle(style: (ol.style.Style | ol.style.Style[] | ol.StyleFunction | null | undefined)): void;
     }
 
     /**
@@ -8472,7 +8473,7 @@ export namespace source {
          * @return Layer style function.
          * @api stable
          */
-        getStyleFunction(): (ol.StyleFunction);
+        getStyleFunction(): (ol.StyleFunction | undefined);
 
         /**
          * Set the style for features.  This can be a single style object, an array
@@ -8484,7 +8485,7 @@ export namespace source {
          * @param style Layer style.
          * @api stable
          */
-        setStyle(style: (ol.style.Style | ol.style.Style[] | ol.StyleFunction)): void;
+        setStyle(style: (ol.style.Style | ol.style.Style[] | ol.StyleFunction | null | undefined)): void;
     }
 
     /**
@@ -10831,7 +10832,7 @@ export type FeatureLoader = (extent: ol.Extent, resolution: number, proj: ol.pro
  * {@link ol.Feature} to be styled.
  *
  */
-export type FeatureStyleFunction = (resolution: number) => (ol.style.Style | ol.style.Style[]);
+export type FeatureStyleFunction = (resolution: number) => (ol.style.Style | ol.style.Style[] | null);
 
 /**
  * {@link ol.source.Vector} sources use a function of this type to get the url
@@ -10981,7 +10982,7 @@ export interface StyleImageOptions {
  * or an array of them. This way e.g. a vector layer can be styled.
  *
  */
-export type StyleFunction = (feature: (ol.Feature | ol.render.Feature), resolution: number) => (ol.style.Style | ol.style.Style[]);
+export type StyleFunction = (feature: (ol.Feature | ol.render.Feature), resolution: number) => (ol.style.Style | ol.style.Style[] | null);
 
 /**
  * A function that takes an {@link ol.Feature} as argument and returns an
diff --git a/types/openlayers/openlayers-tests.ts b/types/openlayers/openlayers-tests.ts
index 6e28ad4cd2..d631a9e9bb 100644
--- a/types/openlayers/openlayers-tests.ts
+++ b/types/openlayers/openlayers-tests.ts
@@ -418,6 +418,14 @@ feature.setStyle(styleArray);
 feature.setStyle(featureStyleFunction);
 feature.setStyle(styleFunction);
 feature.setProperties(object);
+const nullStyleFunction = (feature: (ol.Feature|ol.render.Feature), resolution: number): null => {
+    return null;
+};
+const nullFeatureStyleFunction = (resolution: number): null => {
+  return null;
+};
+feature.setStyle(nullStyleFunction);
+feature.setStyle(nullFeatureStyleFunction);
 
 //
 // ol.View
@@ -573,6 +581,10 @@ const vectorLayer: ol.layer.Vector = new ol.layer.Vector({
     zIndex: -1
 });
 
+vectorLayer.setStyle(nullStyleFunction);
+vectorLayer.setStyle(null);
+vectorLayer.setStyle(undefined);
+
 //
 // ol.layer.VectorTile
 //