diff --git a/external/corefx b/external/corefx
index 33308c540f2a..ee3acec16b37 160000
--- a/external/corefx
+++ b/external/corefx
@@ -1 +1 @@
-Subproject commit 33308c540f2a06d11f555a80244728941f09f628
+Subproject commit ee3acec16b37bec5016da129e1e3840097ca629b
diff --git a/mcs/class/System.Net.Http/HttpRequestMessage.Mono.cs b/mcs/class/System.Net.Http/HttpRequestMessage.Mono.cs
index 87adab770f66..91f381915f1e 100644
--- a/mcs/class/System.Net.Http/HttpRequestMessage.Mono.cs
+++ b/mcs/class/System.Net.Http/HttpRequestMessage.Mono.cs
@@ -12,6 +12,10 @@ static bool IsAllowedAbsoluteUri (Uri uri)
 				return true;
 #endif
 
+			// Mono URI handling which does not distinguish between file and url absolute paths without scheme
+			if (uri.Scheme == Uri.UriSchemeFile && uri.OriginalString.StartsWith ("/", StringComparison.Ordinal))
+				return true;
+
 			return HttpUtilities.IsHttpUri (uri);
 		}
 	}
diff --git a/mcs/class/System.Net.Http/Test/System.Net.Http/HttpClientTest.cs b/mcs/class/System.Net.Http/Test/System.Net.Http/HttpClientTest.cs
index 7163231796cf..402be6aa876e 100644
--- a/mcs/class/System.Net.Http/Test/System.Net.Http/HttpClientTest.cs
+++ b/mcs/class/System.Net.Http/Test/System.Net.Http/HttpClientTest.cs
@@ -375,8 +375,7 @@ public void Send ()
 			Assert.AreEqual (response, client.SendAsync (request).Result, "#1");
 		}
 
-		[Test]
-		[Category ("NotWorking")]
+		[Test]		
 		public void Send_BaseAddress ()
 		{
 			var mh = new HttpMessageHandlerMock ();