diff --git a/pkgs/misc/themes/qtcurve/default.nix b/pkgs/misc/themes/qtcurve/default.nix
index 78f2a594569..e63f6846002 100644
--- a/pkgs/misc/themes/qtcurve/default.nix
+++ b/pkgs/misc/themes/qtcurve/default.nix
@@ -23,7 +23,10 @@ stdenv.mkDerivation {
     xlibs.libxshmfence
   ];
 
-  patches = [ ./qtcurve-1.8.18-install-paths.patch ];
+  patches = [
+    ./qtcurve-1.8.18-install-paths.patch
+    ./qtcurve-1.8.18-toolbar-alpha.patch
+  ];
 
   cmakeFlags = ''
     -DENABLE_QT5=OFF
diff --git a/pkgs/misc/themes/qtcurve/qtcurve-1.8.18-toolbar-alpha.patch b/pkgs/misc/themes/qtcurve/qtcurve-1.8.18-toolbar-alpha.patch
new file mode 100644
index 00000000000..85400e6f0f6
--- /dev/null
+++ b/pkgs/misc/themes/qtcurve/qtcurve-1.8.18-toolbar-alpha.patch
@@ -0,0 +1,34 @@
+diff --git a/qt4/style/qtcurve.cpp b/qt4/style/qtcurve.cpp
+index d7659f5..aede882 100644
+--- a/qt4/style/qtcurve.cpp
++++ b/qt4/style/qtcurve.cpp
+@@ -12436,7 +12436,12 @@ Style::drawMenuOrToolBarBackground(const QWidget *widget, QPainter *p,
+     if (!qtcIsCustomBgnd(&opts) || !qtcIsFlat(app) ||
+         (menu && SHADE_NONE != opts.shadeMenubars)) {
+         p->save();
++#if 0
++        // Revert for now
++        // This is necessary for correct opacity on the menubar but may
++        // break transparent gradient.
+         p->setCompositionMode(QPainter::CompositionMode_Source);
++#endif
+         QRect rx(r);
+         QColor col(menu && (option->state & State_Enabled ||
+                             SHADE_NONE != opts.shadeMenubars) ?
+diff --git a/qt5/style/qtcurve.cpp b/qt5/style/qtcurve.cpp
+index c43b8a3..135eddc 100644
+--- a/qt5/style/qtcurve.cpp
++++ b/qt5/style/qtcurve.cpp
+@@ -3398,7 +3398,12 @@ Style::drawMenuOrToolBarBackground(const QWidget *widget, QPainter *p,
+     if (!qtcIsCustomBgnd(&opts) || !qtcIsFlat(app) ||
+         (menu && opts.shadeMenubars != SHADE_NONE)) {
+         p->save();
++#if 0
++        // Revert for now
++        // This is necessary for correct opacity on the menubar but may
++        // break transparent gradient.
+         p->setCompositionMode(QPainter::CompositionMode_Source);
++#endif
+         QRect rx(r);
+         QColor col(menu && (option->state & State_Enabled ||
+                             opts.shadeMenubars != SHADE_NONE) ?