diff --git a/pkgs/applications/science/math/cemu-ti/default.nix b/pkgs/applications/science/math/cemu-ti/default.nix
index 547b57b312db..e1fa87c4bd3a 100644
--- a/pkgs/applications/science/math/cemu-ti/default.nix
+++ b/pkgs/applications/science/math/cemu-ti/default.nix
@@ -21,6 +21,11 @@ stdenv.mkDerivation (finalAttrs: {
 
   sourceRoot = "${finalAttrs.src.name}/gui/qt/";
 
+  patches = [
+    # This is resolved upstream, but I can't apply the patch because the
+    # sourceRoot isn't set to the base of the Git repo.
+    ./resolve-ambiguous-constexpr.patch
+  ];
 
   nativeBuildInputs = [
     cmake
diff --git a/pkgs/applications/science/math/cemu-ti/resolve-ambiguous-constexpr.patch b/pkgs/applications/science/math/cemu-ti/resolve-ambiguous-constexpr.patch
new file mode 100644
index 000000000000..572fffc062e0
--- /dev/null
+++ b/pkgs/applications/science/math/cemu-ti/resolve-ambiguous-constexpr.patch
@@ -0,0 +1,13 @@
+diff --git a/mainwindow.cpp b/mainwindow.cpp
+index f03a743e..70c29a45 100644
+--- a/mainwindow.cpp
++++ b/mainwindow.cpp
+@@ -970,7 +970,7 @@ void MainWindow::showEvent(QShowEvent *e) {
+ DockWidget *MainWindow::redistributeFindDock(const QPoint &pos) {
+     QWidget *child = childAt(pos);
+     if (QTabBar *tabBar = findSelfOrParent<QTabBar *>(child)) {
+-        child = childAt({pos.x(), tabBar->mapTo(this, QPoint{}).y() - 1});
++        child = childAt(QPoint({pos.x(), tabBar->mapTo(this, QPoint{}).y() - 1}));
+     }
+     return findSelfOrParent<DockWidget *>(child);
+ }