diff --git a/src/plugins/bookmarks/bookmarkmanager.cpp b/src/plugins/bookmarks/bookmarkmanager.cpp
index 39957f2596279a3809e307a1a46e00939ac8d80f..3197fbc4d193fc773fe511b8bb36d97ff040772c 100644
--- a/src/plugins/bookmarks/bookmarkmanager.cpp
+++ b/src/plugins/bookmarks/bookmarkmanager.cpp
@@ -119,7 +119,7 @@ void BookmarkDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
     painter->save();
 
     QFontMetrics fm(opt.font);
-    static int lwidth = fm.width("8888") + 18;
+    static int lwidth = fm.width(QLatin1String("8888")) + 18;
 
     QColor backgroundColor;
     QColor textColor;
@@ -753,11 +753,11 @@ void BookmarkManager::addBookmark(Bookmark *bookmark, bool userset)
 void BookmarkManager::addBookmark(const QString &s)
 {
     // index3 is a frontier beetween note text and other bookmarks data
-    int index3 = s.lastIndexOf('\t');
+    int index3 = s.lastIndexOf(QLatin1Char('\t'));
     if (index3 < 0)
         index3 = s.size();
-    int index2 = s.lastIndexOf(':', index3 - 1);
-    int index1 = s.indexOf(':');
+    int index2 = s.lastIndexOf(QLatin1Char(':'), index3 - 1);
+    int index1 = s.indexOf(QLatin1Char(':'));
 
     if (index3 != -1 || index2 != -1 || index1 != -1) {
         const QString &filePath = s.mid(index1+1, index2-index1-1);
@@ -795,7 +795,7 @@ void BookmarkManager::saveBookmarks()
     foreach (const Bookmark *bookmark, m_bookmarksList)
             list << bookmarkToString(bookmark);
 
-    sessionManager()->setValue("Bookmarks", list);
+    sessionManager()->setValue(QLatin1String("Bookmarks"), list);
 }
 
 void BookmarkManager::operateTooltip(TextEditor::ITextEditor *textEditor, const QPoint &pos, Bookmark *mark)
@@ -814,7 +814,7 @@ void BookmarkManager::operateTooltip(TextEditor::ITextEditor *textEditor, const
 void BookmarkManager::loadBookmarks()
 {
     removeAllBookmarks();
-    const QStringList &list = sessionManager()->value("Bookmarks").toStringList();
+    const QStringList &list = sessionManager()->value(QLatin1String("Bookmarks")).toStringList();
     foreach (const QString &bookmarkString, list)
         addBookmark(bookmarkString);
 
diff --git a/src/plugins/bookmarks/bookmarks.pro b/src/plugins/bookmarks/bookmarks.pro
index ec84fb75118404a9fe25923a5fd9a430bd11a6d7..0c87874cd20b6bcfbd60986484d4bc300723e492 100644
--- a/src/plugins/bookmarks/bookmarks.pro
+++ b/src/plugins/bookmarks/bookmarks.pro
@@ -6,6 +6,8 @@ include(../../plugins/projectexplorer/projectexplorer.pri)
 include(../../plugins/coreplugin/coreplugin.pri)
 include(../../plugins/texteditor/texteditor.pri)
 
+DEFINES += QT_NO_CAST_FROM_ASCII
+
 HEADERS += bookmarksplugin.h \
            bookmark.h \
            bookmarkmanager.h \
diff --git a/src/plugins/bookmarks/bookmarks.qbs b/src/plugins/bookmarks/bookmarks.qbs
index c7d02f9e7daf39ccd72d61b70550599051fd0022..b4d4926fe7cc2b769397d08aaeb04243a033d9ab 100644
--- a/src/plugins/bookmarks/bookmarks.qbs
+++ b/src/plugins/bookmarks/bookmarks.qbs
@@ -13,6 +13,7 @@ QtcPlugin {
     Depends { name: "Locator" }
 
     Depends { name: "cpp" }
+    cpp.defines: base.concat(["QT_NO_CAST_FROM_ASCII"])
 
     files: [
         "bookmark.cpp",