diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7710028..a1768b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,7 +86,7 @@ add_library(logger ${LIB_METHOD}
 set(SOURCE
         src/main.cpp
         src/IPRefresher.cpp
-        )
+        src/Credentials.cpp)
 
 add_executable(iprefresher ${SOURCE})
 
diff --git a/inc/Credentials.h b/inc/Credentials.h
index 1e82694..3bbc1c8 100644
--- a/inc/Credentials.h
+++ b/inc/Credentials.h
@@ -4,29 +4,19 @@
 
 #pragma once
 
-
 #include <string>
 
 class Credentials {
 public:
-    static const std::string dynuapikey;
+    static std::string dynuapikey;
 
-    static const std::string domainid; //id of the dynu domain
-    static const std::string domainname;
+    static std::string domainid; //id of the dynu domain
+    static std::string domainname;
 
-    static const std::string telegramApiKey;
-    static const std::string chatId;
+    static std::string telegramApiKey;
+    static std::string chatId;
 
     static bool checkCredentialValidity();
-};
 
-const std::string Credentials::dynuapikey = "";
-const std::string Credentials::domainid = ""; //id of the dynu domain
-const std::string Credentials::domainname = "";
-
-static const std::string Credentials::telegramApiKey = "";
-static const std::string Credentials::chatId = "";
-
-bool Credentials::checkCredentialValidity() {
-    return !(dynuapikey.empty() || domainid.empty() || domainname.empty());
-}
+private:
+};
\ No newline at end of file
diff --git a/src/Credentials.cpp b/src/Credentials.cpp
new file mode 100644
index 0000000..9ae7227
--- /dev/null
+++ b/src/Credentials.cpp
@@ -0,0 +1,16 @@
+//
+// Created by lukas on 11.02.20.
+//
+
+#include <Credentials.h>
+
+std::string Credentials::dynuapikey = "";
+std::string Credentials::domainid = ""; //id of the dynu domain
+std::string Credentials::domainname = "";
+
+std::string Credentials::telegramApiKey = "";
+std::string Credentials::chatId = "";
+
+bool Credentials::checkCredentialValidity() {
+    return !(Credentials::dynuapikey.empty() || Credentials::domainid.empty() || Credentials::domainname.empty());
+}