diff --git a/src/corelib/tools/qstringmatcher.cpp b/src/corelib/tools/qstringmatcher.cpp
index 67e7ad3825c..67d3f0ebc84 100644
--- a/src/corelib/tools/qstringmatcher.cpp
+++ b/src/corelib/tools/qstringmatcher.cpp
@@ -252,7 +252,7 @@ void QStringMatcher::setCaseSensitivity(Qt::CaseSensitivity cs)
 {
     if (cs == q_cs)
         return;
-    bm_init_skiptable((const ushort *)q_pattern.unicode(), q_pattern.size(), p.q_skiptable, cs);
+    bm_init_skiptable((const ushort *)p.uc, p.len, p.q_skiptable, cs);
     q_cs = cs;
 }
 
diff --git a/tests/auto/corelib/tools/qstringmatcher/tst_qstringmatcher.cpp b/tests/auto/corelib/tools/qstringmatcher/tst_qstringmatcher.cpp
index 0c098cb1c39..8a55f544491 100644
--- a/tests/auto/corelib/tools/qstringmatcher/tst_qstringmatcher.cpp
+++ b/tests/auto/corelib/tools/qstringmatcher/tst_qstringmatcher.cpp
@@ -54,12 +54,21 @@ void tst_QStringMatcher::qstringmatcher()
 // public Qt::CaseSensitivity caseSensitivity() const
 void tst_QStringMatcher::caseSensitivity()
 {
-    QStringMatcher matcher;
+    const QString haystack = QStringLiteral("foobarFoo");
+    const QStringRef needle = haystack.rightRef(3); // "Foo"
+    QStringMatcher matcher(needle.data(), needle.size());
+
+    QCOMPARE(matcher.caseSensitivity(), Qt::CaseSensitive);
+    QCOMPARE(matcher.indexIn(haystack), 6);
+
+    matcher.setCaseSensitivity(Qt::CaseInsensitive);
+
+    QCOMPARE(matcher.caseSensitivity(), Qt::CaseInsensitive);
+    QCOMPARE(matcher.indexIn(haystack), 0);
 
     matcher.setCaseSensitivity(Qt::CaseSensitive);
     QCOMPARE(matcher.caseSensitivity(), Qt::CaseSensitive);
-    matcher.setCaseSensitivity(Qt::CaseInsensitive);
-    QCOMPARE(matcher.caseSensitivity(), Qt::CaseInsensitive);
+    QCOMPARE(matcher.indexIn(haystack), 6);
 }
 
 void tst_QStringMatcher::indexIn_data()