diff --git a/src/core/article.h b/src/core/article.h
index f3b50d5..9b3f200 100644
--- a/src/core/article.h
+++ b/src/core/article.h
@@ -2,8 +2,8 @@
 #define ARTICLE_H
 
 #include "entity.h"
-#include "sale.h"
-#include "seller.h"
+//#include "sale.h"
+//#include "seller.h"
 
 #include <memory>
 #include <string>
diff --git a/src/core/sale.h b/src/core/sale.h
index 9aaf1fa..f039a69 100644
--- a/src/core/sale.h
+++ b/src/core/sale.h
@@ -7,7 +7,7 @@
 
 #include "boost/date_time/posix_time/posix_time.hpp"
 
-class Article;
+//class Article;
 
 using ArticlesVec = std::vector<Article*>;
 
diff --git a/src/core/seller.h b/src/core/seller.h
index e6670ce..e1da001 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -8,7 +8,7 @@
 #include <string>
 #include <vector>
 
-class Article;
+//class Article;
 
 class Seller : public Entity
 {
diff --git a/test/test_article.cpp b/test/test_article.cpp
index a92ed69..1b0fe75 100644
--- a/test/test_article.cpp
+++ b/test/test_article.cpp
@@ -1,6 +1,7 @@
 #define BOOST_TEST_MODULE article
 
 #include "../src/core/article.h"
+#include "../src/core/sale.h"
 
 #include <boost/test/included/unit_test.hpp>
 
diff --git a/test/test_sale.cpp b/test/test_sale.cpp
index 5bd4374..fe5a600 100644
--- a/test/test_sale.cpp
+++ b/test/test_sale.cpp
@@ -1,6 +1,8 @@
 #define BOOST_TEST_MODULE sale
 
 #include "../src/core/sale.h"
+#include "../src/core/seller.h"
+#include "../src/core/article.h"
 
 #include <vector>
 
diff --git a/test/test_seller.cpp b/test/test_seller.cpp
index 2b8f935..45a41d6 100644
--- a/test/test_seller.cpp
+++ b/test/test_seller.cpp
@@ -30,7 +30,7 @@ BOOST_AUTO_TEST_CASE(create_many)
 }
 
 BOOST_AUTO_TEST_CASE(with_article) {
-    Seller seller{};
+    Seller seller{"Max", "Mustermann"};
     auto article = std::make_unique<Article>();
     article->setDescription("Test article");
     seller.addArticle(std::move(article));