diff --git a/recode-3.7.5-test-Fix-signedness-mismatch.patch b/recode-3.7.5-test-Fix-signedness-mismatch.patch
new file mode 100644
index 0000000..422f1e9
--- /dev/null
+++ b/recode-3.7.5-test-Fix-signedness-mismatch.patch
@@ -0,0 +1,42 @@
+From d007389422007adf9cee50830b8dae9884802d77 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
+Date: Thu, 12 Sep 2019 12:43:56 +0200
+Subject: [PATCH] test: Fix signedness mismatch
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GCC 9.2.1 warns:
+
+Recode.c: In function ‘__pyx_pf_6Recode_7Request_8pair_sequence’:
+Recode.c:3096:45: warning: comparison of integer expressions of different signedness: ‘unsigned int’ and ‘short int’ [-Wsign-compare]
+ 3096 |   for (__pyx_v_counter = 0; __pyx_v_counter < __pyx_t_2; __pyx_v_counter++) {
+      |                                             ^
+
+A comparison between differently signed variable is dangerous because the
+signed value is converted to an unsigned value of the same width and that
+mangles the value and leads to comparing unintended values.
+
+This patch fixes it.
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ tests/Recode.pyx | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/tests/Recode.pyx b/tests/Recode.pyx
+index a7982a2..545c1a1 100644
+--- a/tests/Recode.pyx
++++ b/tests/Recode.pyx
+@@ -604,7 +604,7 @@ cdef class Request:
+     def pair_sequence(self):
+         list = []
+         cdef recode_step step
+-        cdef unsigned counter
++        cdef short counter
+         for counter from 0 <= counter < self.request.sequence_length:
+             step = self.request.sequence_array[counter]
+             list.append((step.before.name, step.after.name))
+-- 
+2.21.0
+
diff --git a/recode.spec b/recode.spec
index 87623fc..7032ae8 100644
--- a/recode.spec
+++ b/recode.spec
@@ -61,6 +61,8 @@ Patch0:     recode-3.7.1-Rename-coliding-hash-functions.patch
 # Fix a possible buffer overflow in transform_utf16_java(),
 # in upstream after 3.7.5
 Patch1:     recode-3.7.5-Fix-a-couple-of-potential-buffer-overflows.patch
+# Fix a type mismatch in tests, <https://github.com/rrthomas/recode/pull/23>
+Patch2:     recode-3.7.5-test-Fix-signedness-mismatch.patch
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  coreutils
@@ -100,6 +102,7 @@ This package provides deader files for recode library.
 %setup -q
 %patch0 -p1
 %patch1 -p1
+%patch2 -p1
 autoreconf -fi
 
 %build
@@ -150,6 +153,7 @@ rm $RPM_BUILD_ROOT%{_libdir}/*.la
 * Thu Sep 12 2019 Petr Pisar <ppisar@redhat.com> - 3.7.5-1
 - 3.7.5 bump
 - Fix a possible buffer overflow in transform_utf16_java()
+- Fix a type mismatch in tests
 
 * Mon Sep 02 2019 Petr Pisar <ppisar@redhat.com> - 3.7.4-1
 - 3.7.4 bump