diff --git a/packages/@o3r/core/builders/lib-build/index.ts b/packages/@o3r/core/builders/lib-build/index.ts
index 922b533eb1..d7e8b1db94 100644
--- a/packages/@o3r/core/builders/lib-build/index.ts
+++ b/packages/@o3r/core/builders/lib-build/index.ts
@@ -21,7 +21,7 @@ import {
 const libBuildOptions = ['target', 'skipJasmineFixtureWorkaround'];
 
 export default createBuilder<LibraryBuilderSchema>(createBuilderWithMetricsIfInstalled(async (options, context): Promise<BuilderOutput> => {
-  const specifiedRoot = context.target?.project && (await context.getProjectMetadata(context.target.project)).root?.toString();
+  const specifiedRoot = context.target?.project && (await context.getProjectMetadata(context.target.project)).root as string;
   const ROOT_PATH = specifiedRoot ? path.resolve(context.workspaceRoot, specifiedRoot) : context.currentDirectory;
   const SRC_PATH = path.resolve(ROOT_PATH, 'src');
   const SRC_PACKAGE_JSON = path.resolve(SRC_PATH, 'package.json');
diff --git a/packages/@o3r/core/builders/run-script/index.ts b/packages/@o3r/core/builders/run-script/index.ts
index b20869c195..158b5d3469 100644
--- a/packages/@o3r/core/builders/run-script/index.ts
+++ b/packages/@o3r/core/builders/run-script/index.ts
@@ -23,7 +23,7 @@ import type {
 export default createBuilder<RunScriptBuilderSchema>(createBuilderWithMetricsIfInstalled(async (options, context): Promise<BuilderOutput> => {
   context.reportRunning();
   context.reportProgress(1, 1, `Running ${options.script} !!!`);
-  const specifiedRoot = context.target?.project && (await context.getProjectMetadata(context.target.project)).root?.toString();
+  const specifiedRoot = context.target?.project && (await context.getProjectMetadata(context.target.project)).root as string;
   const projectRoot = specifiedRoot ? resolve(context.workspaceRoot, specifiedRoot) : context.currentDirectory;
 
   const angularJsonPath = join(context.workspaceRoot, 'angular.json');