diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index ba26f7f0da..2f8f0f90fd 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -6004,9 +6004,16 @@ LayerResult GCode::process_layer(
 
                             const WipingExtrusions::ExtruderPerCopy *entity_overrides = nullptr;
                             if (! layer_tools.has_extruder(correct_extruder_id)) {
-                                // this entity is not overridden, but its extruder is not in layer_tools - we'll print it
-                                // by last extruder on this layer (could happen e.g. when a wiping object is taller than others - dontcare extruders are eradicated from layer_tools)
-                                correct_extruder_id = layer_tools.extruders.back();
+                                // A mixed-color slot is absent from layer_tools.extruders by design:
+                                // resolve_mixed_filaments() replaced it with its physical components,
+                                // and the sublayer block emits its geometry separately. Reassigning it
+                                // to the last extruder here would print it in the wrong colour, so only
+                                // fall back for genuinely stale (dontcare) extruders.
+                                if (!layer_tools.is_mixed_slot(correct_extruder_id)) {
+                                    // this entity is not overridden, but its extruder is not in layer_tools - we'll print it
+                                    // by last extruder on this layer (could happen e.g. when a wiping object is taller than others - dontcare extruders are eradicated from layer_tools)
+                                    correct_extruder_id = layer_tools.extruders.back();
+                                }
                             }
                             printing_extruders.clear();
                             if (is_anything_overridden && use_overrides) {