diff --git a/CHANGELOG.md b/CHANGELOG.md
index d64e65f125..6cdb4b06dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,12 @@
 
 - Print patterns in warnings using rescript printer https://github.com/rescript-lang/rescript-compiler/pull/5492
 
+# 10.0.1
+
+#### :bug: Bug Fix
+
+- Fix issue where watch mode would give an error on Windows https://github.com/rescript-lang/rescript-compiler/pull/5621
+
 # 10.0.0
 
 **Compiler**
diff --git a/rescript b/rescript
index 03d6a87367..f200dc0d6b 100755
--- a/rescript
+++ b/rescript
@@ -204,7 +204,8 @@ function acquireBuild() {
     return false;
   } else {
     try {
-      fs.openSync(lockFileName, "wx", 0o664);
+      const fid = fs.openSync(lockFileName, "wx", 0o664);
+      fs.closeSync(fid);
       is_building = true;
     } catch (err) {
       if (err.code === "EEXIST") {