diff --git a/gnu/local.mk b/gnu/local.mk
index 264a343b3c7..cfb1c2f9cb1 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1075,7 +1075,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/calls-disable-application-test.patch	\
   %D%/packages/patches/calls-disable-sip-test.patch		\
   %D%/packages/patches/camlboot-dynamically-allocate-stack-signal.patch	\
-  %D%/packages/patches/capnproto-fix-test.patch		\
   %D%/packages/patches/capstone-fix-python-constants.patch	\
   %D%/packages/patches/catdoc-CVE-2017-11110.patch		\
   %D%/packages/patches/chez-irregex-import-cond-expand.patch	\
diff --git a/gnu/packages/patches/capnproto-fix-test.patch b/gnu/packages/patches/capnproto-fix-test.patch
deleted file mode 100644
index 4b207644922..00000000000
--- a/gnu/packages/patches/capnproto-fix-test.patch
+++ /dev/null
@@ -1,11 +0,0 @@
-diff -u a/src/kj/string-test.c++ b/src/kj/string-test.c++
---- a/src/kj/string-test.c++
-+++ b/src/kj/string-test.c++
-@@ -22,6 +22,7 @@
- #include "string.h"
- #include <kj/compat/gtest.h>
- #include <string>
-+#include <cstdint>
- #include "vector.h"
- 
- namespace kj {
diff --git a/gnu/packages/serialization.scm b/gnu/packages/serialization.scm
index 7df6d7f358e..f7bf738d50e 100644
--- a/gnu/packages/serialization.scm
+++ b/gnu/packages/serialization.scm
@@ -681,8 +681,7 @@ This package also provides @samp{kdlpp}, a C++20 wrapper around @samp{ckdl}.")
                     version ".tar.gz"))
               (sha256
                (base32
-                "1vs2zpk4l55hb4lq4kldbwdqcjnwm1jblhcaqxmii9dxrd7f807d"))
-              (patches (search-patches "capnproto-fix-test.patch"))))
+                "1vs2zpk4l55hb4lq4kldbwdqcjnwm1jblhcaqxmii9dxrd7f807d"))))
     (build-system cmake-build-system)
     (arguments
      `(#:phases