diff --git a/src/geo.rs b/src/geo.rs
index fc0b8aa..c70ab66 100644
--- a/src/geo.rs
+++ b/src/geo.rs
@@ -182,6 +182,7 @@ impl Into<db::Polygon<i32>> for &Polygon {
             exterior: (&self.exterior).into(),
             interiors: self.interiors.iter().map(|p| p.into()).collect(),
         }
+        .normalized()
     }
 }