diff --git a/python-authheaders.spec b/python-authheaders.spec
index 33b7e51..e1b6e11 100644
--- a/python-authheaders.spec
+++ b/python-authheaders.spec
@@ -52,7 +52,7 @@ A library wrapping email authentication header verification and generation.
 %setup -q -n authheaders-%{version}
 
 %build
-LANG=en_US.UTF-8
+export LANG=en_US.UTF-8
 %python_build
 
 %install
@@ -60,7 +60,7 @@ LANG=en_US.UTF-8
 %python_expand %fdupes %{buildroot}%{$python_sitelib}
 
 %check
-LANG=en_US.UTF-8
+export LANG=en_US.UTF-8
 %pytest
 
 %files %{python_files}