diff --git a/dev-ml/ppx_deriving_yojson/files/ppx_deriving_yojson-3.6.1-src_test_dune-ounit2.patch b/dev-ml/ppx_deriving_yojson/files/ppx_deriving_yojson-3.6.1-src_test_dune-ounit2.patch
deleted file mode 100644
index fe5bcab48afcd..0000000000000
--- a/dev-ml/ppx_deriving_yojson/files/ppx_deriving_yojson-3.6.1-src_test_dune-ounit2.patch
+++ /dev/null
@@ -1,10 +0,0 @@
---- a/src_test/dune
-+++ b/src_test/dune
-@@ -1,6 +1,6 @@
- (executable
-  (name test_ppx_yojson)
-- (libraries oUnit result)
-+ (libraries ounit2 result)
-  (preprocess (pps ppx_deriving.show ppx_deriving_yojson))
-  (flags (:standard -w -9-39-27-34-37)))
-