diff --git a/src/shared/write-file-atomically.ts b/src/shared/write-file-atomically.ts
index 09ce5b7d5..7f6544761 100644
--- a/src/shared/write-file-atomically.ts
+++ b/src/shared/write-file-atomically.ts
@@ -16,7 +16,7 @@ export function writeFileAtomically(
 ): void {
   const tempPath = `${filePath}.tmp`
   writeFileSync(tempPath, content, "utf-8")
-  const tempFileDescriptor = openSync(tempPath, "r")
+  const tempFileDescriptor = openSync(tempPath, "r+")
   try {
     tolerantFsyncSync(tempFileDescriptor, `writeFileAtomically:${filePath}`, deps.fsyncSync)
   } finally {