diff --git a/src/convert/replacements.ts b/src/convert/replacements.ts
index 2ad1fd3eda..62a6cb1dbc 100644
--- a/src/convert/replacements.ts
+++ b/src/convert/replacements.ts
@@ -230,4 +230,4 @@ export const stringToRegex = (input: string): RegExp =>
   // eslint-disable-next-line no-useless-escape
   new RegExp(input.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), 'g');
 
-const posixifyPaths = (f: string): string => f.split(sep).join(posix.sep);
+export const posixifyPaths = (f: string): string => f.split(sep).join(posix.sep);
diff --git a/test/convert/replacements.test.ts b/test/convert/replacements.test.ts
index 9e02136352..399c3f99e5 100644
--- a/test/convert/replacements.test.ts
+++ b/test/convert/replacements.test.ts
@@ -8,7 +8,13 @@ import * as path from 'path';
 import { assert, expect } from 'chai';
 import Sinon = require('sinon');
 import { Lifecycle } from '@salesforce/core';
-import { getReplacements, matchesFile, replacementIterations, stringToRegex } from '../../src/convert/replacements';
+import {
+  getReplacements,
+  matchesFile,
+  replacementIterations,
+  stringToRegex,
+  posixifyPaths,
+} from '../../src/convert/replacements';
 import { matchingContentFile } from '../mock';
 import * as replacementsForMock from '../../src/convert/replacements';
 
@@ -63,7 +69,8 @@ describe('marking replacements on a component', () => {
   it('marks a string replacement from env', async () => {
     assert(cmp.xml);
     const result = await getReplacements(cmp, [
-      { filename: cmp.xml, stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
+      // spec says filename path should be posix.  The mocks are using join, so on windows they are wrong
+      { filename: posixifyPaths(cmp.xml), stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
     ]);
     expect(result).to.deep.equal({
       [cmp.xml]: [
@@ -78,7 +85,9 @@ describe('marking replacements on a component', () => {
   });
   it('marks string replacements from file', async () => {
     assert(cmp.xml);
-    const result = await getReplacements(cmp, [{ filename: cmp.xml, stringToReplace: 'foo', replaceWithFile: 'bar' }]);
+    const result = await getReplacements(cmp, [
+      { filename: posixifyPaths(cmp.xml), stringToReplace: 'foo', replaceWithFile: 'bar' },
+    ]);
     expect(result).to.deep.equal({
       [cmp.xml]: [
         {
@@ -94,7 +103,7 @@ describe('marking replacements on a component', () => {
   it('marks regex replacements on a matching file', async () => {
     assert(cmp.xml);
     const result = await getReplacements(cmp, [
-      { filename: cmp.xml, regexToReplace: '.*foo.*', replaceWithEnv: 'FOO_REPLACEMENT' },
+      { filename: posixifyPaths(cmp.xml), regexToReplace: '.*foo.*', replaceWithEnv: 'FOO_REPLACEMENT' },
     ]);
     expect(result).to.deep.equal({
       [cmp.xml]: [
@@ -110,8 +119,8 @@ describe('marking replacements on a component', () => {
   it('marks 2 replacements on one file', async () => {
     assert(cmp.xml);
     const result = await getReplacements(cmp, [
-      { filename: cmp.xml, stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
-      { filename: cmp.xml, stringToReplace: 'baz', replaceWithEnv: 'FOO_REPLACEMENT' },
+      { filename: posixifyPaths(cmp.xml), stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
+      { filename: posixifyPaths(cmp.xml), stringToReplace: 'baz', replaceWithEnv: 'FOO_REPLACEMENT' },
     ]);
     expect(result).to.deep.equal({
       [cmp.xml]: [
@@ -159,8 +168,8 @@ describe('marking replacements on a component', () => {
     assert(cmp.content);
     assert(cmp.xml);
     const result = await getReplacements(cmp, [
-      { filename: cmp.xml, stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
-      { filename: cmp.content, stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
+      { filename: posixifyPaths(cmp.xml), stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
+      { filename: posixifyPaths(cmp.content), stringToReplace: 'foo', replaceWithEnv: 'FOO_REPLACEMENT' },
     ]);
     expect(result).to.deep.equal({
       [cmp.xml]: [