diff --git a/001-libkcapi-1.3.0-werror.patch b/001-libkcapi-1.3.0-werror.patch
new file mode 100644
index 0000000..e1fd9ba
--- /dev/null
+++ b/001-libkcapi-1.3.0-werror.patch
@@ -0,0 +1,13 @@
+diff -uPr libkcapi-1.3.0/lib/doc/bin/docproc.c libkcapi-1.3.0.werror/lib/doc/bin/docproc.c
+--- libkcapi-1.3.0/lib/doc/bin/docproc.c	2021-04-18 11:55:57.000000000 -0400
++++ libkcapi-1.3.0.werror/lib/doc/bin/docproc.c	2021-07-12 08:13:21.812438118 -0400
+@@ -361,7 +361,8 @@
+ {
+ 	char *vec[4]; /* kerneldoc -list file NULL */
+ 	pid_t pid;
+-	ssize_t ret, i, count, start;
++	ssize_t ret, i, count;
++	unsigned int start;
+ 	char real_filename[PATH_MAX + 1];
+ 	int pipefd[2];
+ 	char *data, *str;
diff --git a/libkcapi.spec b/libkcapi.spec
index 66e68a2..58ea165 100644
--- a/libkcapi.spec
+++ b/libkcapi.spec
@@ -135,6 +135,8 @@ Source1:        https://www.chronox.de/%{name}/%{name}-%{version}.tar.xz.asc
 Source2:        sha512hmac-openssl.sh
 Source3:        fipshmac-openssl.sh
 
+Patch1:         001-libkcapi-1.3.0-werror.patch
+
 BuildRequires:  bash
 BuildRequires:  coreutils
 BuildRequires:  gcc