diff --git a/src/Microsoft.AspNet.Identity.AspNetCoreCompat/project.json b/src/Microsoft.AspNet.Identity.AspNetCoreCompat/project.json
index 967ea2a5a0..d24ee02b66 100644
--- a/src/Microsoft.AspNet.Identity.AspNetCoreCompat/project.json
+++ b/src/Microsoft.AspNet.Identity.AspNetCoreCompat/project.json
@@ -29,7 +29,6 @@
   "frameworks": {
     "net451": {
       "frameworkAssemblies": {
-        "System.Collections": "",
         "System.Data": ""
       }
     }