diff --git a/tests/test_build_latex.py b/tests/test_build_latex.py
index 9131ede01..ae347a8e6 100644
--- a/tests/test_build_latex.py
+++ b/tests/test_build_latex.py
@@ -97,4 +97,5 @@ def test_latex(app, status, warning):
 def test_latex_add_latex_package(app, status, warning):
     app.add_latex_package('foo')
     app.builder.build_all()
-    assert '\\usepackage{foo}' in (app.outdir / 'SphinxTests.tex').text()
+    result = (app.outdir / 'SphinxTests.tex').text(encoding='utf8')
+    assert '\\usepackage{foo}' in result