diff --git a/lib/make-spawn-args.js b/lib/make-spawn-args.js
index 1c9f02c..73ffbe4 100644
--- a/lib/make-spawn-args.js
+++ b/lib/make-spawn-args.js
@@ -37,7 +37,7 @@ const makeSpawnArgs = options => {
     npm_lifecycle_event: event,
     npm_lifecycle_script: cmd,
     npm_config_node_gyp,
-  })
+  }, event)
 
   const spawnOpts = {
     env: spawnEnv,
diff --git a/lib/set-path.js b/lib/set-path.js
index c59c270..2730183 100644
--- a/lib/set-path.js
+++ b/lib/set-path.js
@@ -1,3 +1,4 @@
+const { log } = require('proc-log')
 const { resolve, dirname, delimiter } = require('path')
 // the path here is relative, even though it does not need to be
 // in order to make the posix tests pass in windows
@@ -6,7 +7,7 @@ const nodeGypPath = resolve(__dirname, '../lib/node-gyp-bin')
 // Windows typically calls its PATH environ 'Path', but this is not
 // guaranteed, nor is it guaranteed to be the only one.  Merge them
 // all together in the order they appear in the object.
-const setPATH = (projectPath, binPaths, env) => {
+const setPATH = (projectPath, binPaths, env, event) => {
   const PATH = Object.keys(env).filter(p => /^path$/i.test(p) && env[p])
     .map(p => env[p].split(delimiter))
     .reduce((set, p) => set.concat(p.filter(concatted => !set.includes(concatted))), [])
@@ -14,6 +15,12 @@ const setPATH = (projectPath, binPaths, env) => {
 
   const pathArr = []
   if (binPaths) {
+    for (const bin of binPaths) {
+      if (bin.includes(delimiter)) {
+        const context = event ? `"${event}" script` : 'script execution'
+        log.warn('run-script', `Project path contains delimiter ("${delimiter}"), ${context} may not behave as expected.`)
+      }
+    }
     pathArr.push(...binPaths)
   }
   // unshift the ./node_modules/.bin from every folder
diff --git a/test/make-spawn-args.js b/test/make-spawn-args.js
index 110f28f..17504af 100644
--- a/test/make-spawn-args.js
+++ b/test/make-spawn-args.js
@@ -141,4 +141,52 @@ t.test('spawn args', async t => {
     }))
     t.ok(spawk.done())
   })
+
+  await t.test('binPaths containing delimiter logs warning', async t => {
+    const { delimiter } = require('path')
+    const { log } = require('proc-log')
+    const originalWarn = log.warn
+    let warningLogged = false
+
+    log.warn = (category, message) => {
+      if (category === 'run-script' && message.includes('delimiter') && message.includes('"test" script')) {
+        warningLogged = true
+      }
+    }
+    spawk.spawn(
+      /.*/,
+      false,
+      e => (e.env.PATH || e.env.Path).includes(`/path/with${delimiter}delimiter`)
+    )
+    await t.resolves(() => runScript({
+      pkg,
+      binPaths: [`/path/with${delimiter}delimiter`],
+      path: testdir,
+      event: 'test',
+    }))
+
+    t.ok(warningLogged, 'warning should be logged when binPath contains delimiter')
+    t.ok(spawk.done())
+    log.warn = originalWarn
+  })
+
+  await t.test('binPaths containing delimiter logs generic warning without event', async t => {
+    const { delimiter } = require('path')
+    const { log } = require('proc-log')
+    const setPATH = require('../lib/set-path.js')
+    const originalWarn = log.warn
+    let warningLogged = false
+
+    log.warn = (category, message) => {
+      if (category === 'run-script' && message.includes('delimiter') && message.includes('script execution')) {
+        warningLogged = true
+      }
+    }
+
+    // Test setPATH directly with no event (simulates npx/exec scenario)
+    setPATH(testdir, [`/path/with${delimiter}delimiter`], {}, '')
+
+    t.ok(warningLogged, 'warning should be logged with generic message when no event')
+    log.warn = originalWarn
+  })
 })