diff --git a/golang-github-pelletier-toml.spec b/golang-github-pelletier-toml.spec
index 3255eb7..c332a78 100644
--- a/golang-github-pelletier-toml.spec
+++ b/golang-github-pelletier-toml.spec
@@ -48,6 +48,8 @@ BuildRequires:  golang(gopkg.in/yaml.v2)
 %prep
 %goprep
 cp %{S:1} %{S:2} .
+# https://github.com/pelletier/go-toml/issues/428
+sed -i 's|unknown unit z in duration 1z|unknown unit \\\"z\\\" in duration \\\"1z\\\"|' marshal_test.go
 
 %build
 for cmd in cmd/* ; do