diff --git a/plugins/messageviewer/bodypartformatter/autotests/rendertest.cpp b/plugins/messageviewer/bodypartformatter/autotests/rendertest.cpp
index 7b1b8401495062d2723ae85a71b416f79aa0afd6..eaa8aa9157b75ad11b396bb445bc26bbac926d45 100644
--- a/plugins/messageviewer/bodypartformatter/autotests/rendertest.cpp
+++ b/plugins/messageviewer/bodypartformatter/autotests/rendertest.cpp
@@ -32,6 +32,15 @@
 #include <QIcon>
 #include <QProcess>
 
+#ifndef Q_OS_WIN
+void initLocale()
+{
+    setenv("LC_ALL", "en_US.utf-8", 1);
+}
+
+Q_CONSTRUCTOR_FUNCTION(initLocale)
+#endif
+
 void RenderTest::testRender_data()
 {
     QTest::addColumn<QString>("mailFileName");