diff --git a/science/openmodelica/files/patch-OMEdit_OMEditLIB_Modeling_ModelWidgetContainer.cpp b/science/openmodelica/files/patch-OMEdit_OMEditLIB_Modeling_ModelWidgetContainer.cpp
new file mode 100644
index 000000000000..c0ec4a17af5a
--- /dev/null
+++ b/science/openmodelica/files/patch-OMEdit_OMEditLIB_Modeling_ModelWidgetContainer.cpp
@@ -0,0 +1,16 @@
+Fix build with Qt 6.10.1. The QString::arg() method no longer accepts
+implicit conversions. [1]
+
+[1] https://doc.qt.io/qt-6/qstring.html#arg-2
+
+--- OMEdit/OMEditLIB/Modeling/ModelWidgetContainer.cpp.orig	2025-11-24 16:18:03 UTC
++++ OMEdit/OMEditLIB/Modeling/ModelWidgetContainer.cpp
+@@ -3943,7 +3943,7 @@ void GraphicsView::getCoordinateSystemAndGraphics(QStr
+   }
+   // add the initial scale
+   if (mCoordinateSystem.hasInitialScale()) {
+-    coOrdinateSystemList.append(QString("initialScale=%1").arg(mCoordinateSystem.getInitialScale()));
++    coOrdinateSystemList.append(QString("initialScale=%1").arg(static_cast<int>(mCoordinateSystem.getInitialScale())));
+   }
+   // add the grid
+   if (mCoordinateSystem.hasGrid()) {