diff --git a/locales.cpp b/locales.cpp
index 54a876d..b27044c 100644
--- a/locales.cpp
+++ b/locales.cpp
@@ -21,10 +21,21 @@ using namespace QuasarAppUtils;
 bool QuasarAppUtils::Locales::findQm(const QString& localePrefix,
                                      QFileInfoList &qmFiles) {
 
+    if (localePrefix.isEmpty())
+        return false;
+
+    qDebug() << "Search for " << localePrefix;
+
+    const auto prefixes = localePrefix.split(QRegExp("[_-]"));
+
+    auto prefixIt = prefixes.begin();
+
     for (const auto &location: qAsConst(_locations)) {
-        qmFiles += QDir(location).entryInfoList({"*" + localePrefix + "*.qm"}, QDir::Files);
+        qmFiles += QDir(location).entryInfoList({"*" + (*prefixIt).toLower() + "*.qm"}, QDir::Files);
     }
 
+    qDebug() << "Found" << qmFiles;
+
     return qmFiles.size();
 }
 
diff --git a/locales.h b/locales.h
index 8e094ed..b1977dd 100644
--- a/locales.h
+++ b/locales.h
@@ -33,6 +33,8 @@ namespace QuasarAppUtils {
  * @code{cpp}
  *  QuasarAppUtils::Locales::init(QLocale::system(), "myPath");
  * @endcode
+ *
+ * @note All translations qm files should be named with lower case example : en.qm
  */
 class QUASARAPPSHARED_EXPORT Locales : public QObject
 {