diff --git a/src/magick-image.ts b/src/magick-image.ts
index 983d724b..3fecf387 100644
--- a/src/magick-image.ts
+++ b/src/magick-image.ts
@@ -3491,14 +3491,14 @@ export class MagickImage extends NativeInstance implements IMagickImage {
     }
 
     private useException<TReturnType>(func: (exception: Exception) => TReturnType): TReturnType {
-        return Exception.use<TReturnType>(func, error => {
+        return Exception.use(func, error => {
             if (this.onWarning !== undefined)
                 this.onWarning(new WarningEvent(error));
         });
     }
 
     private useExceptionPointer<TReturnType>(func: (exception: number) => TReturnType): TReturnType {
-        return Exception.usePointer<TReturnType>(func, error => {
+        return Exception.usePointer(func, error => {
             if (this.onWarning !== undefined)
                 this.onWarning(new WarningEvent(error));
         });
diff --git a/tests/test-images.ts b/tests/test-images.ts
index bf8a9d0e..47ce5ce3 100644
--- a/tests/test-images.ts
+++ b/tests/test-images.ts
@@ -23,9 +23,7 @@ abstract class TestImageBase<TImageType extends Cloneable<TImageType>> {
         if (this._image === undefined)
             this._image = this.load();
 
-        return this._image.clone(image => {
-            return func(image);
-        });
+        return this._image.clone(func);
     }
 
     abstract load(): TImageType;
@@ -95,9 +93,7 @@ class EmptyTestImage {
     use<TReturnType>(func: (image: IMagickImage) => TReturnType): TReturnType;
     use<TReturnType>(func: (image: IMagickImage) => Promise<TReturnType>): Promise<TReturnType>;
     use<TReturnType>(func: (image: IMagickImage) => TReturnType | Promise<TReturnType>): TReturnType | Promise<TReturnType> {
-        return MagickImage.create()._use(image => {
-            return func(image);
-        });
+        return MagickImage.create()._use(func);
     }
 }
 
@@ -105,9 +101,7 @@ class EmptyTestImageCollection {
     use<TReturnType>(func: (images: IMagickImageCollection) => TReturnType): TReturnType;
     use<TReturnType>(func: (images: IMagickImageCollection) => Promise<TReturnType>): Promise<TReturnType>;
     use<TReturnType>(func: (images: IMagickImageCollection) => TReturnType | Promise<TReturnType>): TReturnType | Promise<TReturnType> {
-        return MagickImageCollection.create()._use(images => {
-            return func(images);
-        });
+        return MagickImageCollection.create()._use(func);
     }
 }