diff --git a/YavscLib/project.json b/YavscLib/project.json
index cfb4413d..b7b3b13b 100644
--- a/YavscLib/project.json
+++ b/YavscLib/project.json
@@ -14,15 +14,16 @@
   },
   "dependencies": {},
   "frameworks": {
-    "net451": {},
+    "net451": {
+    },
     ".NETPortable,Version=v4.5,Profile=Profile111": {
       "frameworkAssemblies": {
+        "System": "4.0.0",
         "System.Runtime": "4.0.0",
         "System.Globalization": "4.0.0",
         "System.Resources.ResourceManager": "4.0.0",
-        "System.Collections": "4.0.0",
-        "System.Collections.Generic": "4.0.0"
+        "System.Collections": "4.0.0"
       }
-    }
+    } 
   }
 }
diff --git a/YavscLib/project.lock.json b/YavscLib/project.lock.json
index 79695a3d..6565f069 100644
--- a/YavscLib/project.lock.json
+++ b/YavscLib/project.lock.json
@@ -14,11 +14,11 @@
     "": [],
     ".NETFramework,Version=v4.5.1": [],
     ".NETPortable,Version=v4.5,Profile=Profile111": [
+      "fx/System >= 4.0.0",
       "fx/System.Runtime >= 4.0.0",
       "fx/System.Globalization >= 4.0.0",
       "fx/System.Resources.ResourceManager >= 4.0.0",
-      "fx/System.Collections >= 4.0.0",
-      "fx/System.Collections.Generic >= 4.0.0"
+      "fx/System.Collections >= 4.0.0"
     ]
   }
 }
\ No newline at end of file