diff --git a/packages/next/src/build/index.ts b/packages/next/src/build/index.ts
index 750818b244aac..f1e638bade732 100644
--- a/packages/next/src/build/index.ts
+++ b/packages/next/src/build/index.ts
@@ -249,7 +249,6 @@ function pageToRoute(page: string) {
 
 export default async function build(
   dir: string,
-  conf = null,
   reactProductionProfiling = false,
   debugOutput = false,
   runLint = true,
@@ -271,7 +270,7 @@ export default async function build(
 
       const config: NextConfigComplete = await nextBuildSpan
         .traceChild('load-next-config')
-        .traceAsyncFn(() => loadConfig(PHASE_PRODUCTION_BUILD, dir, conf))
+        .traceAsyncFn(() => loadConfig(PHASE_PRODUCTION_BUILD, dir))
 
       const distDir = path.join(dir, config.distDir)
       setGlobal('phase', PHASE_PRODUCTION_BUILD)
diff --git a/packages/next/src/cli/next-build.ts b/packages/next/src/cli/next-build.ts
index 31f5b5bd01975..a2d5546ef2dec 100755
--- a/packages/next/src/cli/next-build.ts
+++ b/packages/next/src/cli/next-build.ts
@@ -72,7 +72,6 @@ const nextBuild: CliCommand = (argv) => {
 
   return build(
     dir,
-    null,
     args['--profile'],
     args['--debug'] || process.env.NEXT_DEBUG_BUILD,
     !args['--no-lint'],