diff --git a/qml/pages/ReaderPage.qml b/qml/pages/ReaderPage.qml
index b214618..b9664d1 100644
--- a/qml/pages/ReaderPage.qml
+++ b/qml/pages/ReaderPage.qml
@@ -259,10 +259,15 @@ Page {
         var key = appSettings.bookmarkKey(page.bookId, page.bookFormat)
         var ch = 0
         var fr = 0.0
-        if (key.length > 0 && book.parseBookmarkKey(key, ch, fr)) {
-            page.currentChapter = Math.max(0, Math.min(ch, book.chapterCount - 1))
-            page.chapterFraction = fr
+        if (key.length > 0) {
+            var r = book.parseBookmarkKey(key)
+            if (r && r.hasOwnProperty("chapter")) {
+                ch = Math.max(0, Math.min(r.chapter, book.chapterCount - 1))
+                fr = r.fraction
+            }
         }
+        page.currentChapter = ch
+        page.chapterFraction = fr
         loadChapter()
     }
 
diff --git a/src/epub.cpp b/src/epub.cpp
index f4ade5c..da9ddc9 100644
--- a/src/epub.cpp
+++ b/src/epub.cpp
@@ -443,20 +443,19 @@ QString EpubBook::makeBookmarkKey(int chapterIndex, double fraction) const
     return QStringLiteral("cw:v1:%1:%2").arg(chapterIndex).arg(fraction, 0, 'f', 4);
 }
 
-bool EpubBook::parseBookmarkKey(const QString &key, int *chapterIndex, double *fraction) const
+QVariantMap EpubBook::parseBookmarkKey(const QString &key) const
 {
+    QVariantMap result;
     const QStringList parts = key.split(QLatin1Char(':'));
     if (parts.size() != 4 || parts.at(0) != QLatin1String("cw")
             || parts.at(1) != QLatin1String("v1"))
-        return false;
+        return result;
     bool okChapter = false, okFrac = false;
     const int ch = parts.at(2).toInt(&okChapter);
     const double fr = parts.at(3).toDouble(&okFrac);
     if (!okChapter || !okFrac)
-        return false;
-    if (chapterIndex)
-        *chapterIndex = ch;
-    if (fraction)
-        *fraction = fr;
-    return true;
+        return result;
+    result.insert(QStringLiteral("chapter"), ch);
+    result.insert(QStringLiteral("fraction"), fr);
+    return result;
 }
diff --git a/src/epub.h b/src/epub.h
index a68b936..53dfbfb 100644
--- a/src/epub.h
+++ b/src/epub.h
@@ -43,7 +43,8 @@ public:
 
     // chiave segno locale, es. "cw:v1:3:0.42" (capitolo 3, 42% del capitolo)
     Q_INVOKABLE QString makeBookmarkKey(int chapterIndex, double fraction) const;
-    Q_INVOKABLE bool parseBookmarkKey(const QString &key, int *chapterIndex, double *fraction) const;
+    // restituisce {chapter, fraction} oppure mappa vuota se la chiave non è valida
+    Q_INVOKABLE QVariantMap parseBookmarkKey(const QString &key) const;
 
 signals:
     void changed();