diff --git a/packages/modular-scripts/src/esbuild-scripts/utils/formatPath.ts b/packages/modular-scripts/src/esbuild-scripts/utils/formatPath.ts
index ca3dbbb23..c3c08adc3 100644
--- a/packages/modular-scripts/src/esbuild-scripts/utils/formatPath.ts
+++ b/packages/modular-scripts/src/esbuild-scripts/utils/formatPath.ts
@@ -2,6 +2,6 @@ import path from 'path';
 
 export function normalizeToPosix<T extends string | undefined>(pathName: T): T {
   return (
-    pathName ? pathName.split(path.sep).join(path.posix.sep) : pathName
+    pathName ? pathName.split(path.win32.sep).join(path.posix.sep) : pathName
   ) as T;
 }