diff --git a/autotests/unit/engine/queryparsertest.cpp b/autotests/unit/engine/queryparsertest.cpp
--- a/autotests/unit/engine/queryparsertest.cpp
+++ b/autotests/unit/engine/queryparsertest.cpp
@@ -40,6 +40,7 @@
     void testAccentSearch();
     void testUnderscoreSplitting();
     void testAutoExpand();
+    void testUnicodeLowering();
 };
 
 void QueryParserTest::testSinglePrefixWord()
@@ -218,6 +219,17 @@
     }
 }
 
+void QueryParserTest::testUnicodeLowering()
+{
+    // This string is unicode mathematical italic "Hedge"
+    QString str = QString::fromUtf8("\xF0\x9D\x90\xBB\xF0\x9D\x91\x92\xF0\x9D\x91\x91\xF0\x9D\x91\x94\xF0\x9D\x91\x92");
+
+    QueryParser parser;
+    EngineQuery query = parser.parseQuery(str);
+    EngineQuery expected = EngineQuery("hedge", EngineQuery::StartsWith, 1);
+    QCOMPARE(query, expected);
+}
+
 QTEST_MAIN(QueryParserTest)
 
 #include "queryparsertest.moc"
diff --git a/autotests/unit/engine/termgeneratortest.cpp b/autotests/unit/engine/termgeneratortest.cpp
--- a/autotests/unit/engine/termgeneratortest.cpp
+++ b/autotests/unit/engine/termgeneratortest.cpp
@@ -38,6 +38,7 @@
     void testUnderscore_splitting();
     void testAccetCharacters();
     void testUnicodeCompatibleComposition();
+    void testUnicodeLowering();
     void testEmails();
     void testWordPositions();
 
@@ -130,6 +131,20 @@
     QCOMPARE(str.toUtf8(), output);
 }
 
+void TermGeneratorTest::testUnicodeLowering()
+{
+    // This string is unicode mathematical italic "Hedge"
+    QString str = QString::fromUtf8("\xF0\x9D\x90\xBB\xF0\x9D\x91\x92\xF0\x9D\x91\x91\xF0\x9D\x91\x94\xF0\x9D\x91\x92");
+
+    Document doc;
+    TermGenerator termGen(&doc);
+    termGen.indexText(str);
+
+    QList<QByteArray> words = allWords(doc);
+
+    QCOMPARE(words, {QByteArray("hedge")});
+}
+
 void TermGeneratorTest::testEmails()
 {
     QString str = QString::fromLatin1("me@vhanda.in");
diff --git a/src/engine/queryparser.cpp b/src/engine/queryparser.cpp
--- a/src/engine/queryparser.cpp
+++ b/src/engine/queryparser.cpp
@@ -112,11 +112,8 @@
 
             QString str = text.mid(start, end - start);
 
-            // Get the string ready for saving
-            str = str.toLower();
-
-            // Remove all accents
-            const QString denormalized = str.normalized(QString::NormalizationForm_KD);
+            // Remove all accents and lower it
+            const QString denormalized = str.normalized(QString::NormalizationForm_KD).toLower();
             QString cleanString;
             Q_FOREACH (const QChar& ch, denormalized) {
                 auto cat = ch.category();
diff --git a/src/engine/termgenerator.cpp b/src/engine/termgenerator.cpp
--- a/src/engine/termgenerator.cpp
+++ b/src/engine/termgenerator.cpp
@@ -57,11 +57,9 @@
 
             QString str = text.mid(start, end - start);
 
-            // Get the string ready for saving
-            str = str.toLower();
-
-            // Remove all accents
-            const QString denormalized = str.normalized(QString::NormalizationForm_KD);
+            // Remove all accents. It is important to call toLower after normalization,
+            // since some exotic unicode symbols can remain uppercase
+            const QString denormalized = str.normalized(QString::NormalizationForm_KD).toLower();
 
             QString cleanString;
             cleanString.reserve(denormalized.size());