diff --git a/src/lib/tools/iconprovider.cpp b/src/lib/tools/iconprovider.cpp
index c8dd160ed..9588b900f 100644
--- a/src/lib/tools/iconprovider.cpp
+++ b/src/lib/tools/iconprovider.cpp
@@ -187,6 +187,8 @@ QImage IconProvider::imageForUrl(const QUrl &url, bool allowNull)
         return allowNull ? QImage() : IconProvider::emptyWebImage();
     }
 
+    QMutexLocker locker(&instance()->m_iconCacheMutex);
+
     const QByteArray encodedUrl = encodeUrl(url);
 
     if (QImage *img = instance()->m_urlImageCache.object(encodedUrl)) {
@@ -224,6 +226,8 @@ QImage IconProvider::imageForDomain(const QUrl &url, bool allowNull)
         return allowNull ? QImage() : IconProvider::emptyWebImage();
     }
 
+    QMutexLocker locker(&instance()->m_iconCacheMutex);
+
     foreach (const BufferedIcon &ic, instance()->m_iconBuffer) {
         if (ic.first.host() == url.host()) {
             return ic.second;
@@ -249,6 +253,8 @@ IconProvider* IconProvider::instance()
 
 void IconProvider::saveIconsToDatabase()
 {
+    QMutexLocker locker(&instance()->m_iconCacheMutex);
+
     foreach (const BufferedIcon &ic, m_iconBuffer) {
         QByteArray ba;
         QBuffer buffer(&ba);
diff --git a/src/lib/tools/iconprovider.h b/src/lib/tools/iconprovider.h
index f033f2900..acf03ac66 100644
--- a/src/lib/tools/iconprovider.h
+++ b/src/lib/tools/iconprovider.h
@@ -23,6 +23,7 @@
 #include <QImage>
 #include <QUrl>
 #include <QCache>
+#include <QMutex>
 
 #include <functional>
 
@@ -82,6 +83,7 @@ private:
     QIcon m_bookmarkIcon;
     QVector<BufferedIcon> m_iconBuffer;
     QCache<QByteArray, QImage> m_urlImageCache;
+    QMutex m_iconCacheMutex;
 
     AutoSaver* m_autoSaver;
 };