diff --git a/WFObj.cc b/WFObj.cc
index 78b1490..d5fc99d 100644
--- a/WFObj.cc
+++ b/WFObj.cc
@@ -286,12 +286,12 @@ vector<WFObj::Face> WFObj::readFaces(const std::vector<std::string> & parts)
     vector<Face> faces;
     VertexRef refs[4];
     int parts_len = parts.size();
-    if (parts_len < 3 || parts_len > 4)
+    if (parts_len < 4 || parts_len > 5)
     {
         cerr << "WFObj: error: faces can only have 3 or 4 vertices!" << endl;
         return faces;
     }
-    for (int i = 1; i <= parts_len; i++)
+    for (int i = 1; i < parts_len; i++)
         refs[i - 1] = readVertexRef(parts[i]);
     Face f;
     f.vertices[0] = refs[0];