diff --git a/.cell/cell.toml b/.cell/cell.toml
index 8587966..e43c93f 100644
--- a/.cell/cell.toml
+++ b/.cell/cell.toml
@@ -1,2 +1,2 @@
 [compilation]
-CFLAGS = "-Wno-incompatible-function-pointer-types"
\ No newline at end of file
+CFLAGS = "-Wno-incompatible-function-pointer-types -DRTREE_NOATOMICS"
\ No newline at end of file
diff --git a/rtree.c b/rtree.c
index 4dede8b..28a3cfb 100644
--- a/rtree.c
+++ b/rtree.c
@@ -60,8 +60,7 @@ QJSCLASS(rtree,)
 JSC_CCALL(rtree_add,
   rtree *tree = js2rtree(js,self);
   JSValue v = argv[0];
-  rect r;
-  JS_GETATOM(js,r,v,rect,rect)
+  rect r = js2rect(js,v);
   NUMTYPE min[3];
   NUMTYPE max[3];
   min[0] = r.x;
@@ -90,8 +89,7 @@ static int rtree_cmp(const JSValue *a, const JSValue *b, JSContext *js)
 JSC_CCALL(rtree_delete,
   rtree *tree = js2rtree(js,self);
   JSValue v = argv[0];
-  rect r;
-  JS_GETATOM(js,r,v,rect,rect)
+  rect r = js2rect(js,v);
   NUMTYPE min[3];
   NUMTYPE max[3];
   min[0] = r.x;