diff --git a/bird.changes b/bird.changes
index aaf4d66..9e4cdec 100644
--- a/bird.changes
+++ b/bird.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Nov 16 12:45:29 UTC 2020 - Mark Stopka <mstopka@opensuse.org>
+
+- Add patch to fix test on Big Endian architectures
+
 -------------------------------------------------------------------
 Fri Sep 11 07:16:11 UTC 2020 - Dirk Mueller <dmueller@suse.com>
 
diff --git a/bird.spec b/bird.spec
index d216aaa..56a3ea3 100644
--- a/bird.spec
+++ b/bird.spec
@@ -31,6 +31,7 @@ Source:         ftp://bird.network.cz/pub/bird/bird-%{version}.tar.gz
 Source1:        bird.service
 Source3:        bird.tmpfiles.d
 Patch0:         gcc10.patch
+Patch1:         fix_test_for_bigendian_arch.patch
 BuildRequires:  bison
 BuildRequires:  flex
 BuildRequires:  ncurses-devel
@@ -66,6 +67,7 @@ This package holds the HTML documentation.
 %prep
 %setup -q
 %patch0 -p1
+%patch1 -p1
 
 %build
 export CFLAGS="${RPM_OPT_FLAGS} -fpic -DPIC -fno-strict-aliasing -Wno-parentheses -Wno-pointer-sign"
diff --git a/fix_test_for_bigendian_arch.patch b/fix_test_for_bigendian_arch.patch
new file mode 100644
index 0000000..c74f6e3
--- /dev/null
+++ b/fix_test_for_bigendian_arch.patch
@@ -0,0 +1,74 @@
+diff --git a/lib/fletcher16_test.c b/lib/fletcher16_test.c
+index 1020e6ecc8cac116dd45710ff7993f2e8641d694..3cd4c302f19700d32b0d3e68d5137b4409bfe976 100644
+--- a/lib/fletcher16_test.c
++++ b/lib/fletcher16_test.c
+@@ -24,24 +24,33 @@ straightforward_fletcher16_compute(const char *data)
+     sum2 = (sum2 + sum1) % 255;
+   }
+ 
+-  return (sum2 << 8) | sum1;
++  sum2 = (sum2 + sum1) % 255;
++  sum2 = (sum2 + sum1) % 255;
++
++  return (sum1 << 8) | sum2;
+ }
+ 
+ static u16
+ straightforward_fletcher16_checksum(const char *data)
+ {
+   u16 csum;
+-  u8 c0,c1,f0,f1;
++  u16 c0,c1,x,y;
+ 
+   csum = straightforward_fletcher16_compute(data);
+-  f0 = csum & 0xff;
+-  f1 = (csum >> 8) & 0xff;
+-  c0 = 0xff - ((f0 + f1) % 0xff);
+-  c1 = 0xff - ((f0 + c0) % 0xff);
++  c0 = (csum >> 8) & 0xff;
++  c1 = csum & 0xff;
++
++  x = (255 +   c0 - c1) % 255;
++  y = (510 - 2*c0 + c1) % 255;
+ 
+-  return (c1 << 8) | c0;
++  if (!x) x = 255;
++  if (!y) y = 255;
++
++  return (x << 8) | y;
+ }
+ 
++const u8 zero16[2] = {};
++
+ static int
+ test_fletcher16(void *out_, const void *in_, const void *expected_out_)
+ {
+@@ -53,7 +62,8 @@ test_fletcher16(void *out_, const void *in_, const void *expected_out_)
+ 
+   fletcher16_init(&ctxt);
+   fletcher16_update(&ctxt, in, strlen(in));
+-  put_u16(out, fletcher16_compute(&ctxt));
++  fletcher16_update(&ctxt, zero16, 2);
++  *out = fletcher16_compute(&ctxt);
+ 
+   return *out == *expected_out;
+ }
+@@ -70,7 +80,8 @@ test_fletcher16_checksum(void *out_, const void *in_, const void *expected_out_)
+ 
+   fletcher16_init(&ctxt);
+   fletcher16_update(&ctxt, in, len);
+-  put_u16(out, fletcher16_final(&ctxt, len, len));
++  fletcher16_update(&ctxt, zero16, 2);
++  *out = fletcher16_final(&ctxt, len+2, len);
+ 
+   return *out == *expected_out;
+ }
+@@ -81,7 +92,7 @@ t_fletcher16_compute(void)
+   struct bt_pair test_vectors[] = {
+     {
+       .in  = "\001\002",
+-      .out = & (const u16) { 0x0403 },
++      .out = & ((const u16) { straightforward_fletcher16_compute("\001\002") }),
+     },
+     {
+       .in  = "",