diff --git a/.npmignore b/.npmignore
index 69664d6..faefae6 100644
--- a/.npmignore
+++ b/.npmignore
@@ -8,3 +8,4 @@ package-lock.json
 yarn.lock
 src/tsconfig.json
 .npmignore
+.travis.yml
diff --git a/src/image-upload/image-upload.component.ts b/src/image-upload/image-upload.component.ts
index 13727bd..2baac19 100644
--- a/src/image-upload/image-upload.component.ts
+++ b/src/image-upload/image-upload.component.ts
@@ -42,7 +42,7 @@ export class ImageUploadComponent implements OnInit {
   @Input()
   fileTooLargeMessage: string;
   @Input('extensions')
-  supportedExtensions: string[] = ['image/*'];
+  supportedExtensions: string[];
 
   private pendingFilesCounter: number = 0;
   @ViewChild('input')
@@ -55,9 +55,8 @@ export class ImageUploadComponent implements OnInit {
     if (!this.fileTooLargeMessage) {
       this.fileTooLargeMessage = 'An image was too large and was not uploaded.' + (this.maxFileSize ? (' The maximum file size is ' + this.maxFileSize / 1024) + 'KiB.' : '');
     }
-    if (this.supportedExtensions) {
-      this.supportedExtensions = this.supportedExtensions.map((ext) => 'image/' + ext);
-    }
+
+    this.supportedExtensions = this.supportedExtensions ? this.supportedExtensions.map((ext) => 'image/' + ext) : ['image/*'];
   }
 
   fileChange(files: FileList) {