diff --git a/io.github.lithe-idea.cargo-build/backend/provider.mjs b/io.github.lithe-idea.cargo-build/backend/provider.mjs
index e9c2e41..e2e2a58 100644
--- a/io.github.lithe-idea.cargo-build/backend/provider.mjs
+++ b/io.github.lithe-idea.cargo-build/backend/provider.mjs
@@ -1,5 +1,5 @@
 import { realpath } from 'node:fs/promises';
-import { dirname, isAbsolute, relative, resolve, sep } from 'node:path';
+import { delimiter, dirname, isAbsolute, relative, resolve, sep } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
 const compare = (a, b) => a < b ? -1 : a > b ? 1 : 0;
@@ -71,7 +71,7 @@ export function registerCargoProvider(backend, PluginError) {
     const args = ['metadata', '--format-version', '1', '--no-deps', '--manifest-path', resolve(directory, 'Cargo.toml')];
     if (options.offline === true) args.push('--offline');
     const processEnvironment = { ...process.env, ...environment };
-    if (tool) processEnvironment.PATH = `${dirname(executable)}:${processEnvironment.PATH ?? ''}`;
+    if (tool) processEnvironment.PATH = `${dirname(executable)}${delimiter}${processEnvironment.PATH ?? ''}`;
     let result;
     try {
       result = await context.run(executable, args, { cwd: directory, env: processEnvironment, maxOutputBytes: 8 * 1024 * 1024 });
diff --git a/test/provider.test.mjs b/test/provider.test.mjs
index ff805f5..8316b3e 100644
--- a/test/provider.test.mjs
+++ b/test/provider.test.mjs
@@ -1,7 +1,7 @@
 import assert from 'node:assert/strict';
 import { mkdtemp, mkdir, realpath, rm, symlink, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
-import { join } from 'node:path';
+import { delimiter, join } from 'node:path';
 import { pathToFileURL } from 'node:url';
 import test from 'node:test';
 import { createBackend, PluginError as SDKPluginError } from '../vendor/lithe-plugin-sdk/src/index.mjs';
@@ -57,7 +57,7 @@ test('initialization is passive; metadata uses the host tool and only supported
   assert.equal(calls[0][0], '/fake-tools/cargo');
   assert.deepEqual(calls[0][1], ['metadata', '--format-version', '1', '--no-deps', '--manifest-path', join(root, 'Cargo.toml'), '--offline']);
   assert.equal(calls[0][2].cwd, root);
-  assert.ok(calls[0][2].env.PATH.startsWith('/fake-tools:'));
+  assert.ok(calls[0][2].env.PATH.startsWith(`/fake-tools${delimiter}`));
 });
 
 test('relative and symlink build-root escapes are refused before Cargo starts', { timeout: 5000 }, async (t) => {