diff --git a/src/corelib/tools/qchar.cpp b/src/corelib/tools/qchar.cpp
index 80233b430a..e3d6c60b0f 100644
--- a/src/corelib/tools/qchar.cpp
+++ b/src/corelib/tools/qchar.cpp
@@ -981,6 +981,8 @@ QChar::Decomposition QChar::decompositionTag(uint ucs4)
 {
     if (ucs4 > UNICODE_LAST_CODEPOINT)
         return QChar::NoDecomposition;
+    if (ucs4 >= Hangul_SBase && ucs4 < Hangul_SBase + Hangul_SCount)
+        return QChar::Canonical;
     const unsigned short index = GET_DECOMPOSITION_INDEX(ucs4);
     if (index == 0xffff)
         return QChar::NoDecomposition;
diff --git a/tests/auto/corelib/tools/qchar/tst_qchar.cpp b/tests/auto/corelib/tools/qchar/tst_qchar.cpp
index 56613a90c2..1a568073cf 100644
--- a/tests/auto/corelib/tools/qchar/tst_qchar.cpp
+++ b/tests/auto/corelib/tools/qchar/tst_qchar.cpp
@@ -608,6 +608,14 @@ void tst_QChar::mirroredChar()
 
 void tst_QChar::decomposition()
 {
+    // Hangul syllables
+    for (uint ucs = 0xac00; ucs <= 0xd7af; ++ucs) {
+        QChar::Decomposition expected = QChar::unicodeVersion(ucs) > QChar::Unicode_Unassigned ? QChar::Canonical : QChar::NoDecomposition;
+        QString desc = QString::fromLatin1("ucs = 0x%1, tag = %2, expected = %3")
+                .arg(QString::number(ucs, 16)).arg(QChar::decompositionTag(ucs)).arg(expected);
+        QVERIFY2(QChar::decompositionTag(ucs) == expected, desc.toLatin1());
+    }
+
     QVERIFY(QChar((ushort)0xa0).decompositionTag() == QChar::NoBreak);
     QVERIFY(QChar((ushort)0xa8).decompositionTag() == QChar::Compat);
     QVERIFY(QChar((ushort)0x41).decompositionTag() == QChar::NoDecomposition);
@@ -805,6 +813,25 @@ void tst_QChar::normalization_manual()
         QVERIFY(composed.normalized(QString::NormalizationForm_KD) == decomposed);
         QVERIFY(composed.normalized(QString::NormalizationForm_KC) == decomposed);
     }
+    {   // hangul
+        QString composed;
+        composed += QChar(0xc154);
+        composed += QChar(0x11f0);
+        QString decomposed;
+        decomposed += QChar(0x1109);
+        decomposed += QChar(0x1167);
+        decomposed += QChar(0x11f0);
+
+        QVERIFY(composed.normalized(QString::NormalizationForm_D) == decomposed);
+        QVERIFY(composed.normalized(QString::NormalizationForm_C) == composed);
+        QVERIFY(composed.normalized(QString::NormalizationForm_KD) == decomposed);
+        QVERIFY(composed.normalized(QString::NormalizationForm_KC) == composed);
+
+        QVERIFY(decomposed.normalized(QString::NormalizationForm_D) == decomposed);
+        QVERIFY(decomposed.normalized(QString::NormalizationForm_C) == composed);
+        QVERIFY(decomposed.normalized(QString::NormalizationForm_KD) == decomposed);
+        QVERIFY(decomposed.normalized(QString::NormalizationForm_KC) == composed);
+    }
 }
 
 void tst_QChar::normalizationCorrections()