diff --git a/src/operation.js b/src/operation.js
index 793f748..f2308d0 100644
--- a/src/operation.js
+++ b/src/operation.js
@@ -7,14 +7,14 @@ import SweepEvent from "./sweep-event"
 import SweepLine from "./sweep-line"
 
 // Limits on iterative processes to prevent infinite loops - usually caused by floating-point math round-off errors.
+const env =
+  typeof process !== "undefined" && typeof process.env !== "undefined"
+    ? process.env
+    : {}
 const POLYGON_CLIPPING_MAX_QUEUE_SIZE =
-  (typeof process !== "undefined" &&
-    process.env.POLYGON_CLIPPING_MAX_QUEUE_SIZE) ||
-  1000000
+  env.POLYGON_CLIPPING_MAX_QUEUE_SIZE || 1000000
 const POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS =
-  (typeof process !== "undefined" &&
-    process.env.POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS) ||
-  1000000
+  env.POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS || 1000000
 
 export class Operation {
   run(type, geom, moreGeoms) {