diff --git a/src/ngx-uploader/classes/ngx-uploader.class.ts b/src/ngx-uploader/classes/ngx-uploader.class.ts
index 97aa72f1..ab19d8ff 100644
--- a/src/ngx-uploader/classes/ngx-uploader.class.ts
+++ b/src/ngx-uploader/classes/ngx-uploader.class.ts
@@ -259,7 +259,7 @@ export class NgUploaderService {
     if (this.allContentTypesAllowed()) {
       return true;
     }
-    if (this.contentTypes.find((type: string) => type === mimetype ) != undefined) {
+    if (this.contentTypes.find((type: string) => type === mimetype ) !== undefined) {
       return true;
     }