diff --git a/debian/patches/0001-system.runtime.caching-Remove-inappropropriate-use-o.patch b/debian/patches/0001-system.runtime.caching-Remove-inappropropriate-use-o.patch
deleted file mode 100644
index eca7c1d675..0000000000
--- a/debian/patches/0001-system.runtime.caching-Remove-inappropropriate-use-o.patch
+++ /dev/null
@@ -1,38 +0,0 @@
-From ffb5c90e08d2f619b207c07c25b8551f52e9913e Mon Sep 17 00:00:00 2001
-From: Marek Safar <marek.safar@gmail.com>
-Date: Sat, 9 May 2015 12:24:20 +0200
-Subject: [PATCH] [system.runtime.caching] Remove inappropropriate use of
- Marshal.SizeOf. Fixes #29667
-
----
- mcs/class/System.Runtime.Caching/ReferenceSources/SRef.cs | 9 ++++++---
- 1 file changed, 6 insertions(+), 3 deletions(-)
-
-diff --git a/mcs/class/System.Runtime.Caching/ReferenceSources/SRef.cs b/mcs/class/System.Runtime.Caching/ReferenceSources/SRef.cs
-index ce0812b..644a2fc 100644
---- a/mcs/class/System.Runtime.Caching/ReferenceSources/SRef.cs
-+++ b/mcs/class/System.Runtime.Caching/ReferenceSources/SRef.cs
-@@ -11,14 +11,17 @@ namespace System.Runtime.Caching {
-      */
-     internal class SRef {
- 
--        private Object _sizedRef;
-+//        private Object _sizedRef;
- 
-         internal SRef (Object target) {
--            _sizedRef = target;
-+//            _sizedRef = target;
-         }
- 
-         internal long ApproximateSize {
--            get { return (long) Marshal.SizeOf (_sizedRef.GetType ()); }
-+            get {
-+                // TODO: .net uses System.SizedReference which contains approximate size after Gen 2 collection
-+                return 16;
-+            }
-         }
- 
-         internal void Dispose() {
--- 
-1.9.1
-
diff --git a/debian/patches/series b/debian/patches/series
index 1d654e8e00..bc84ce1b06 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1,2 +1 @@
-0001-system.runtime.caching-Remove-inappropropriate-use-o.patch
 rename-and-package-symbolicate.patch