diff --git a/src/plugins/help/centralwidget.cpp b/src/plugins/help/centralwidget.cpp
index a185b610744..cabc2d5ad22 100644
--- a/src/plugins/help/centralwidget.cpp
+++ b/src/plugins/help/centralwidget.cpp
@@ -32,7 +32,7 @@
 
 using namespace Help::Internal;
 
-CentralWidget *gStaticCentralWidget = 0;
+static CentralWidget *gStaticCentralWidget = 0;
 
 // -- CentralWidget
 
@@ -46,7 +46,7 @@ CentralWidget::CentralWidget(const Core::Context &context, QWidget *parent)
 CentralWidget::~CentralWidget()
 {
     // TODO: this shouldn't be done here
-    QList<float> zoomFactors;
+    QList<qreal> zoomFactors;
     QStringList currentPages;
     for (int i = 0; i < viewerCount(); ++i) {
         const HelpViewer * const viewer = viewerAt(i);
diff --git a/src/plugins/help/localhelpmanager.cpp b/src/plugins/help/localhelpmanager.cpp
index dee3ef7332d..28ebd548e24 100644
--- a/src/plugins/help/localhelpmanager.cpp
+++ b/src/plugins/help/localhelpmanager.cpp
@@ -263,7 +263,7 @@ QList<float> LocalHelpManager::lastShownPagesZoom()
     return Utils::transform(stringValues, [](const QString &str) { return str.toFloat(); });
 }
 
-void LocalHelpManager::setLastShownPagesZoom(const QList<float> &zoom)
+void LocalHelpManager::setLastShownPagesZoom(const QList<qreal> &zoom)
 {
     const QStringList stringValues = Utils::transform(zoom,
                                                       [](float z) { return QString::number(z); });
diff --git a/src/plugins/help/localhelpmanager.h b/src/plugins/help/localhelpmanager.h
index 4eae028e3ee..39ace0168b8 100644
--- a/src/plugins/help/localhelpmanager.h
+++ b/src/plugins/help/localhelpmanager.h
@@ -82,7 +82,7 @@ public:
     static void setLastShownPages(const QStringList &pages);
 
     static QList<float> lastShownPagesZoom();
-    static void setLastShownPagesZoom(const QList<float> &zoom);
+    static void setLastShownPagesZoom(const QList<qreal> &zoom);
 
     static int lastSelectedTab();
     static void setLastSelectedTab(int index);