diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 6eeac89950..74aa65c000 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -9567,6 +9567,12 @@ bool SketchObject::arePointsCoincident(int GeoId1, PointPos PosId1, int GeoId2,
 
     return false;
 }
+bool SketchObject::hasBlockConstraint() const
+{
+    return std::ranges::any_of(Constraints.getValues(), [](auto& c) {
+        return c->Type == Block;
+    });
+}
 
 void SketchObject::getConstraintIndices(int GeoId, std::vector<int>& constraintList)
 {
diff --git a/src/Mod/Sketcher/App/SketchObject.h b/src/Mod/Sketcher/App/SketchObject.h
index f4135ec3c8..d1223f2e75 100644
--- a/src/Mod/Sketcher/App/SketchObject.h
+++ b/src/Mod/Sketcher/App/SketchObject.h
@@ -648,6 +648,9 @@ public:
     );
     bool arePointsCoincident(int GeoId1, PointPos PosId1, int GeoId2, PointPos PosId2);
 
+    // Returns true if the sketch has 1 or more block constraint
+    bool hasBlockConstraint() const;
+
     /// returns a list of indices of all constraints involving given GeoId
     void getConstraintIndices(int GeoId, std::vector<int>& constraintList);
 
diff --git a/src/Mod/Sketcher/Gui/EditDatumDialog.cpp b/src/Mod/Sketcher/Gui/EditDatumDialog.cpp
index e4846b4874..e0a041fa6d 100644
--- a/src/Mod/Sketcher/Gui/EditDatumDialog.cpp
+++ b/src/Mod/Sketcher/Gui/EditDatumDialog.cpp
@@ -418,10 +418,12 @@ void EditDatumDialog::performAutoScale(double newDatum)
     // if there are external geometries, it is safe to assume that the sketch
     // was drawn with these geometries as scale references (use <= 2 because
     // the sketch axis are considered as external geometries)
+    // if the sketch has blocked geometries, it is considered a scale indicator
+    // and autoscale is not performed either
     if ((autoScaleMode == static_cast<int>(SketcherGui::AutoScaleMode::Always)
          || (autoScaleMode == static_cast<int>(SketcherGui::AutoScaleMode::WhenNoScaleFeatureIsVisible)
              && !hasVisualFeature(sketch, nullptr, Gui::Application::Instance->activeDocument())))
-        && sketch->getExternalGeometryCount() <= 2) {
+        && sketch->getExternalGeometryCount() <= 2 && !sketch->hasBlockConstraint()) {
         try {
             // Handle the case where multiple datum constraints are present but only one is scale
             // defining e.g. a bunch of angle constraints and a single length constraint