diff --git a/Include/tesselator.h b/Include/tesselator.h
index 38e05f1..6d4aa39 100755
--- a/Include/tesselator.h
+++ b/Include/tesselator.h
@@ -192,7 +192,7 @@ void tessDeleteTess( TESStesselator *tess );
 //   pointer - pointer to the first coordinate of the first vertex in the array.
 //   stride - defines offset in bytes between consecutive vertices.
 //   count - number of vertices in contour.
-void tessAddContour( TESStesselator *tess, int size, const void* pointer, int stride, int count );
+void tessAddContour( TESStesselator *tess, int size, const void* pointer, int stride, int count, int reversed );
 
 // tessSetOption() - Toggles optional tessellation parameters
 // Parameters:
diff --git a/Source/tess.c b/Source/tess.c
index 8059bf4..ff1fb07 100755
--- a/Source/tess.c
+++ b/Source/tess.c
@@ -911,7 +911,7 @@ void OutputContours( TESStesselator *tess, TESSmesh *mesh, int vertexSize )
 }
 
 void tessAddContour( TESStesselator *tess, int size, const void* vertices,
-					int stride, int numVertices )
+					int stride, int numVertices, int reversed )
 {
 	const unsigned char *src = (const unsigned char*)vertices;
 	TESShalfEdge *e;
@@ -973,8 +973,8 @@ void tessAddContour( TESStesselator *tess, int size, const void* vertices,
 		* vertices in such an order that a CCW contour will add +1 to
 		* the winding number of the region inside the contour.
 		*/
-		e->winding = 1;
-		e->Sym->winding = -1;
+        e->winding = (reversed) ? -1 : 1;
+        e->Sym->winding = (reversed) ? 1 : -1;
 	}
 }