diff --git a/tile.cpp b/tile.cpp
index 33870f48..1dcd3237 100644
--- a/tile.cpp
+++ b/tile.cpp
@@ -614,8 +614,11 @@ void *partial_feature_worker(void *v) {
 		drawvec geom = (*partials)[i].geoms[0];
 
 		if (t == VT_POLYGON) {
-			geom = clean_or_clip_poly(geom, 0, 0, false, false);
-			fix_by_triangulation(geom, z, out_detail);
+			drawvec cleaned = clean_or_clip_poly(geom, 0, 0, false, false);
+			drawvec fixed = fix_by_triangulation(geom, z, out_detail);
+			if (fixed != cleaned) {
+				geom = fixed;
+			}
 		}
 
 		to_tile_scale(geom, z, out_detail);