diff --git a/packages/nextjs/src/client/index.ts b/packages/nextjs/src/client/index.ts
index 4d09e7e2d170..4c52e7cfd648 100644
--- a/packages/nextjs/src/client/index.ts
+++ b/packages/nextjs/src/client/index.ts
@@ -77,8 +77,7 @@ export function init(options: BrowserOptions): Client | undefined {
   }
 
   try {
-    // @ts-expect-error `process.turbopack` is a magic string that will be replaced by Next.js
-    if (process.turbopack) {
+    if (process.env.TURBOPACK) {
       getGlobalScope().setTag('turbopack', true);
     }
   } catch {
diff --git a/packages/nextjs/src/edge/index.ts b/packages/nextjs/src/edge/index.ts
index 7982667f0c3f..19540618f2aa 100644
--- a/packages/nextjs/src/edge/index.ts
+++ b/packages/nextjs/src/edge/index.ts
@@ -95,8 +95,7 @@ export function init(options: VercelEdgeOptions = {}): void {
   });
 
   try {
-    // @ts-expect-error `process.turbopack` is a magic string that will be replaced by Next.js
-    if (process.turbopack) {
+    if (process.env.TURBOPACK) {
       getGlobalScope().setTag('turbopack', true);
     }
   } catch {
diff --git a/packages/nextjs/src/server/index.ts b/packages/nextjs/src/server/index.ts
index 82d475a719c6..b57cb09eda76 100644
--- a/packages/nextjs/src/server/index.ts
+++ b/packages/nextjs/src/server/index.ts
@@ -368,8 +368,7 @@ export function init(options: NodeOptions): NodeClient | undefined {
   }
 
   try {
-    // @ts-expect-error `process.turbopack` is a magic string that will be replaced by Next.js
-    if (process.turbopack) {
+    if (process.env.TURBOPACK) {
       getGlobalScope().setTag('turbopack', true);
     }
   } catch {