diff --git a/repos/libports/ports/qt5.hash b/repos/libports/ports/qt5.hash
index d229fbfc03..26e70c0d80 100644
--- a/repos/libports/ports/qt5.hash
+++ b/repos/libports/ports/qt5.hash
@@ -1 +1 @@
-821f07b61827f72f0efa968453ae521bf19fa6e8
+4d7c2192509a580b54ac069e68f1e9ac4d9159bd
diff --git a/repos/libports/src/lib/qt5/patches/qt5_qtwebkit_socketstreamhandle.patch b/repos/libports/src/lib/qt5/patches/qt5_qtwebkit_socketstreamhandle.patch
new file mode 100644
index 0000000000..6fb9edfa9d
--- /dev/null
+++ b/repos/libports/src/lib/qt5/patches/qt5_qtwebkit_socketstreamhandle.patch
@@ -0,0 +1,54 @@
+qt5_qtwebkit_socketstreamhandle.patch
+
+From: Christian Prochaska <christian.prochaska@genode-labs.com>
+
+
+---
+ .../network/qt/SocketStreamHandlePrivate.h         |    1 +
+ .../platform/network/qt/SocketStreamHandleQt.cpp   |   14 ++++++++++++++
+ 2 files changed, 15 insertions(+)
+
+diff --git a/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandlePrivate.h b/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandlePrivate.h
+index f447cc2..4e79275 100644
+--- a/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandlePrivate.h
++++ b/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandlePrivate.h
+@@ -65,6 +65,7 @@ public Q_SLOTS:
+ #endif
+ public:
+     void initConnections();
++    void init(const KURL& url);
+     QTcpSocket* m_socket;
+     SocketStreamHandle* m_streamHandle;
+ };
+diff --git a/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandleQt.cpp b/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandleQt.cpp
+index 271edd8..818fada 100644
+--- a/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandleQt.cpp
++++ b/qtwebkit/Source/WebCore/platform/network/qt/SocketStreamHandleQt.cpp
+@@ -57,6 +57,19 @@ SocketStreamHandlePrivate::SocketStreamHandlePrivate(SocketStreamHandle* streamH
+         return;
+ 
+     initConnections();
++ }
++
++/*
++ * This code was factored out from the constructor, because its execution can
++ * end up in 'SocketStreamHandle::platformSend()', which needs the
++ * 'SocketStreamHandle::m_p' member, which gets initialized only after the
++ * constructor returned.
++ *
++ * Genode issue #1677
++ */
++void SocketStreamHandlePrivate::init(const KURL& url)
++{
++    bool isSecure = url.protocolIs("wss");
+ 
+     unsigned int port = url.hasPort() ? url.port() : (isSecure ? 443 : 80);
+ 
+@@ -184,6 +197,7 @@ SocketStreamHandle::SocketStreamHandle(const KURL& url, SocketStreamHandleClient
+ {
+     LOG(Network, "SocketStreamHandle %p new client %p", this, m_client);
+     m_p = new SocketStreamHandlePrivate(this, url);
++    m_p->init(url);
+ }
+ 
+ SocketStreamHandle::SocketStreamHandle(QTcpSocket* socket, SocketStreamHandleClient* client)
diff --git a/repos/libports/src/lib/qt5/patches/series b/repos/libports/src/lib/qt5/patches/series
index 48d58fdec8..b1cf571410 100644
--- a/repos/libports/src/lib/qt5/patches/series
+++ b/repos/libports/src/lib/qt5/patches/series
@@ -11,6 +11,7 @@ qt5_qwidgetwindow.patch
 qt5_qtscript.patch
 qt5_qtnetwork.patch
 qt5_qtwebkit.patch
+qt5_qtwebkit_socketstreamhandle.patch
 qt5_textedit_example.patch
 qt5_openglwindow_example.patch
 qt5_qml.patch