diff --git a/0001-Convert-int-to-string-using-rune.patch b/0001-Convert-int-to-string-using-rune.patch
new file mode 100644
index 0000000..9cb120a
--- /dev/null
+++ b/0001-Convert-int-to-string-using-rune.patch
@@ -0,0 +1,33 @@
+From c38fc1a2bd79c534328e7451db6e708d7cccd972 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Robert-Andr=C3=A9=20Mauchin?= <zebob.m@gmail.com>
+Date: Sat, 8 Aug 2020 01:13:39 +0200
+Subject: [PATCH] Convert int to string using rune()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+See https://github.com/golang/go/issues/32479
+
+Fix #111.
+
+Signed-off-by: Robert-André Mauchin <zebob.m@gmail.com>
+---
+ diffmatchpatch/patch.go | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/diffmatchpatch/patch.go b/diffmatchpatch/patch.go
+index 223c43c..0dbe3bd 100644
+--- a/diffmatchpatch/patch.go
++++ b/diffmatchpatch/patch.go
+@@ -324,7 +324,7 @@ func (dmp *DiffMatchPatch) PatchAddPadding(patches []Patch) string {
+ 	paddingLength := dmp.PatchMargin
+ 	nullPadding := ""
+ 	for x := 1; x <= paddingLength; x++ {
+-		nullPadding += string(x)
++		nullPadding += string(rune(x))
+ 	}
+ 
+ 	// Bump all the patches forward.
+-- 
+2.26.2
+
diff --git a/golang-github-sergi-diff.spec b/golang-github-sergi-diff.spec
index 603def8..be3d6fe 100644
--- a/golang-github-sergi-diff.spec
+++ b/golang-github-sergi-diff.spec
@@ -30,6 +30,8 @@ Summary:        Diff, match and patch text in Go
 License:        ASL 2.0 and MIT
 URL:            %{gourl}
 Source0:        %{gosource}
+# Go 1.15: https://github.com/sergi/go-diff/issues/111
+Patch0:         0001-Convert-int-to-string-using-rune.patch
 
 %if %{with check}
 # Tests
@@ -43,6 +45,7 @@ BuildRequires:  golang(github.com/stretchr/testify/assert)
 
 %prep
 %goprep
+%patch0 -p1
 
 %install
 %gopkginstall