diff --git a/lib/spawn.js b/lib/spawn.js
index 30e5b81..212883c 100644
--- a/lib/spawn.js
+++ b/lib/spawn.js
@@ -33,6 +33,14 @@ function spawn (cmd, args, options, log) {
   const cmdWillOutput = willCmdOutput(options && options.stdio)
 
   if (cmdWillOutput) startRunning(log)
+
+  if (options.env["PATH"]) {
+    const fullPath = options.env["PATH"]
+    const parts = fullPath.split(":")
+    const partsDedup = new Set(parts)
+    options.env["PATH"] = [...partsDedup].join(":")
+  }
+
   const raw = _spawn(cmd, args, options)
   const cooked = new EventEmitter()