diff --git a/src/build123d/build_common.py b/src/build123d/build_common.py
index e5edde3..abfa4a0 100644
--- a/src/build123d/build_common.py
+++ b/src/build123d/build_common.py
@@ -466,7 +466,13 @@ class Builder(ABC, Generic[ShapeT]):
                 elif mode == Mode.INTERSECT:
                     if self._obj is None:
                         raise RuntimeError("Nothing to intersect with")
-                    combined = self._obj.intersect(*typed[self._shape])
+                    intersections: ShapeList[Shape] = ShapeList()
+                    for target in typed[self._shape]:
+                        result = self._obj.intersect(target)
+                        if result is None:
+                            continue
+                        intersections.extend(result)
+                    combined = self._sub_class(intersections)
                 elif mode == Mode.REPLACE:
                     combined = self._sub_class(list(typed[self._shape]))