diff --git a/wasm/src/main/scala/org/scalajs/linker/backend/WebAssemblyLinkerBackend.scala b/wasm/src/main/scala/org/scalajs/linker/backend/WebAssemblyLinkerBackend.scala
index 7ce3c4e..97224d5 100644
--- a/wasm/src/main/scala/org/scalajs/linker/backend/WebAssemblyLinkerBackend.scala
+++ b/wasm/src/main/scala/org/scalajs/linker/backend/WebAssemblyLinkerBackend.scala
@@ -12,6 +12,7 @@ import org.scalajs.linker.interface._
 import org.scalajs.linker.interface.unstable._
 import org.scalajs.linker.standard._
 
+import org.scalajs.linker.backend.javascript.{ByteArrayWriter, SourceMapWriter}
 import org.scalajs.linker.backend.webassembly._
 
 import org.scalajs.linker.backend.wasmemitter.Emitter
@@ -88,13 +89,13 @@ final class WebAssemblyLinkerBackend(
       val emitDebugInfo = !linkerConfig.minify
 
       if (linkerConfig.sourceMap) {
-        val sourceMapWriter = new SourceMapWriterAccess.ByteArrayWriterBox()
+        val sourceMapWriter = new ByteArrayWriter
 
         val wasmFileURI = s"./$wasmFileName"
         val sourceMapURI = s"./$sourceMapFileName"
 
         val smWriter =
-          sourceMapWriter.createSourceMapWriter(wasmFileURI, linkerConfig.relativizeSourceMapBase)
+          new SourceMapWriter(sourceMapWriter, wasmFileURI, linkerConfig.relativizeSourceMapBase)
         val binaryOutput = new BinaryWriter.WithSourceMap(
           wasmModule,
           emitDebugInfo,
diff --git a/wasm/src/main/scala/org/scalajs/linker/backend/webassembly/SourceMapWriterAccess.scala b/wasm/src/main/scala/org/scalajs/linker/backend/webassembly/SourceMapWriterAccess.scala
deleted file mode 100644
index 5734c86..0000000
--- a/wasm/src/main/scala/org/scalajs/linker/backend/webassembly/SourceMapWriterAccess.scala
+++ /dev/null
@@ -1,22 +0,0 @@
-package org.scalajs.linker.backend.webassembly
-
-import java.net.URI
-import java.nio.ByteBuffer
-
-import org.scalajs.linker.backend.javascript.{ByteArrayWriter, SourceMapWriter}
-
-object SourceMapWriterAccess {
-
-  /** A box to hold a `ByteArrayWriter`, which is unfortunately package-private in Scala.js but
-    * required to create a `SourceMapWriter`.
-    */
-  final class ByteArrayWriterBox() {
-    private val underlying = new ByteArrayWriter()
-
-    def createSourceMapWriter(jsFileName: String, relativizeBaseURI: Option[URI]): SourceMapWriter =
-      new SourceMapWriter(underlying, jsFileName, relativizeBaseURI)
-
-    def toByteBuffer(): ByteBuffer =
-      underlying.toByteBuffer()
-  }
-}