diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 1eb3c8d3..6195bdd9 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -1058,7 +1058,7 @@
         }
 
         POLY.subtract(topInner, downInner, bridges, flats, slice.z, minArea, {
-            // wasm: options.wasm
+            wasm: options.wasm
         });
     };
 
diff --git a/wasm/kiri-geo.cpp b/wasm/kiri-geo.cpp
index 259c9e71..f59c455d 100644
--- a/wasm/kiri-geo.cpp
+++ b/wasm/kiri-geo.cpp
@@ -143,7 +143,7 @@ Uint32 poly_union(Uint32 memat, Uint32 polys, float offset) {
 }
 
 __attribute__ ((export_name("poly_diff")))
-Uint32 poly_diff(Uint32 memat, Uint32 polysA, Uint32 polysB, Uint8 AB, Uint8 BA, Uint32 clean) {
+Uint32 poly_diff(Uint32 memat, Uint32 polysA, Uint32 polysB, Uint8 AB, Uint8 BA, float clean) {
 
     Paths inA(polysA);
     Paths inB(polysB);
@@ -154,27 +154,33 @@ Uint32 poly_diff(Uint32 memat, Uint32 polysA, Uint32 polysB, Uint8 AB, Uint8 BA,
 
     Uint32 resat = pos;
 
-    if (AB) {
+    if (AB > 0) {
         Paths outs;
         Clipper clip;
         clip.AddPaths(inA, ptSubject, true);
         clip.AddPaths(inB, ptClip, true);
         clip.Execute(ctDifference, outs, pftEvenOdd, pftEvenOdd);
         if (clean > 0) {
-            CleanPolygons(outs, (double)clean);
+            // CleanPolygons(outs, clean);
+            for (Path po : outs) {
+                CleanPolygon(po, clean);
+            }
         }
         pos = writePolys(outs, pos);
         clip.Clear();
     }
 
-    if (BA) {
+    if (BA > 0) {
         Paths outs;
         Clipper clip;
         clip.AddPaths(inB, ptSubject, true);
         clip.AddPaths(inA, ptClip, true);
         clip.Execute(ctDifference, outs, pftEvenOdd, pftEvenOdd);
         if (clean > 0) {
-            CleanPolygons(outs, (double)clean);
+            // CleanPolygons(outs, clean);
+            for (Path po : outs) {
+                CleanPolygon(po, clean);
+            }
         }
         pos = writePolys(outs, pos);
         clip.Clear();
diff --git a/wasm/kiri-geo.wasm b/wasm/kiri-geo.wasm
index db0d7bd7..81158784 100755
Binary files a/wasm/kiri-geo.wasm and b/wasm/kiri-geo.wasm differ