diff --git a/lib/xmet/spc.py b/lib/xmet/spc.py
index bcf818f..7182278 100644
--- a/lib/xmet/spc.py
+++ b/lib/xmet/spc.py
@@ -84,7 +84,7 @@ def each_poly(parts: list[str]):
         else:
             points.append(parse_coord(part))
 
-    if len(points) > 0:
+    if len(points) >= 3:
         yield shapely.Polygon(points)
 
 class SPCOutlookArea(DatabaseTable):