diff --git a/xs/src/libslic3r/ExPolygonCollection.cpp b/xs/src/libslic3r/ExPolygonCollection.cpp
index 90498a42d..9de1cb786 100644
--- a/xs/src/libslic3r/ExPolygonCollection.cpp
+++ b/xs/src/libslic3r/ExPolygonCollection.cpp
@@ -135,5 +135,10 @@ ExPolygonCollection::append(const ExPolygons &expp)
 {
     this->expolygons.insert(this->expolygons.end(), expp.begin(), expp.end());
 }
+void
+ExPolygonCollection::append(const ExPolygon &expp)
+{
+    this->expolygons.push_back(expp);
+}
 
 }
diff --git a/xs/src/libslic3r/ExPolygonCollection.hpp b/xs/src/libslic3r/ExPolygonCollection.hpp
index 89728c822..57f512336 100644
--- a/xs/src/libslic3r/ExPolygonCollection.hpp
+++ b/xs/src/libslic3r/ExPolygonCollection.hpp
@@ -33,6 +33,7 @@ class ExPolygonCollection
     Polygons contours() const;
     Polygons holes() const;
     void append(const ExPolygons &expolygons);
+    void append(const ExPolygon &expolygons);
 };
 
 inline ExPolygonCollection&