diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97ccfc58b7..a4707f5108 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,11 @@
 * `Worker`: Make DTLS fragment stay within MTU size range ([PR #1156](https://github.com/versatica/mediasoup/pull/1156), based on [PR #1143](https://github.com/versatica/mediasoup/pull/1143) by @vpnts-se).
 
 
+### 3.12.15
+
+* Fix NPM "postinstall" task in Windows ([PR #1187](https://github.com/versatica/mediasoup/pull/1187)).
+
+
 ### 3.12.14
 
 * CI: Use Node.js version 20 ([PR #1177](https://github.com/versatica/mediasoup/pull/1177)).
diff --git a/npm-scripts.mjs b/npm-scripts.mjs
index 23fc6ac535..a12f1e6a41 100644
--- a/npm-scripts.mjs
+++ b/npm-scripts.mjs
@@ -501,7 +501,9 @@ function installMsysMake()
 		pythonPath = String(res.stdout).trim();
 	}
 
-	executeCmd(`${pythonPath} worker\\scripts\\getmake.py`);
+	const dir = path.resolve('worker/out/msys');
+
+	executeCmd(`${pythonPath} worker\\scripts\\getmake.py --dir="${dir}"`);
 }
 
 function ensureDir(dir)
diff --git a/package-lock.json b/package-lock.json
index 454166c872..f13dec0d52 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mediasoup",
-  "version": "3.12.14",
+  "version": "3.12.15",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mediasoup",
-      "version": "3.12.14",
+      "version": "3.12.15",
       "hasInstallScript": true,
       "license": "ISC",
       "dependencies": {
diff --git a/package.json b/package.json
index ccb51ffb30..1bdbec08e9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mediasoup",
-  "version": "3.12.14",
+  "version": "3.12.15",
   "description": "Cutting Edge WebRTC Video Conferencing",
   "contributors": [
     "Iñaki Baz Castillo <ibc@aliax.net> (https://inakibaz.me)",
diff --git a/worker/build.rs b/worker/build.rs
index 7d2264bfaf..2caf96525b 100644
--- a/worker/build.rs
+++ b/worker/build.rs
@@ -16,9 +16,15 @@ fn main() {
     };
 
     let out_dir = env::var("OUT_DIR").unwrap();
-    // Force forward slashes on Windows too so that is plays well with our dumb `Makefile`
+    // Force forward slashes on Windows too so that is plays well with our dumb `Makefile`.
     let mediasoup_out_dir = format!("{}/out", out_dir.replace('\\', "/"));
 
+    // Store original PATH so we make `make clean-all` use it. This is because, in Windows,
+    // we may need to fetch `make` and we store it in out/msys and then we add out/msys/bin
+    // to the PATH, and that folder may contain rm.exe, so `make clean-all` would use
+    // that rm.exe and delete itself and make the task fail.
+    let original_path = env::var("PATH").unwrap();
+
     // Add C++ std lib
     #[cfg(target_os = "linux")]
     {
@@ -78,25 +84,36 @@ fn main() {
     #[cfg(target_os = "windows")]
     {
         if !std::path::Path::new("worker/out/msys/bin/make.exe").exists() {
-            let python = if Command::new("where")
-                .arg("python3.exe")
+            let python = if let Ok(python) = env::var("PYTHON") {
+                python
+            } else if Command::new("where")
+                .arg("python3")
                 .status()
                 .expect("Failed to start")
                 .success()
             {
-                "python3"
+                "python3".to_string()
             } else {
-                "python"
+                "python".to_string()
             };
 
+            let dir = format!("{}/msys", mediasoup_out_dir.replace('\\', "/"));
+
             if !Command::new(python)
                 .arg("scripts\\getmake.py")
+                .arg("--dir")
+                .arg(dir.clone())
                 .status()
                 .expect("Failed to start")
                 .success()
             {
                 panic!("Failed to install MSYS/make")
             }
+
+            env::set_var(
+                "PATH",
+                format!("{}\\bin;{}", dir, env::var("PATH").unwrap()),
+            );
         }
 
         env::set_var(
@@ -161,6 +178,7 @@ fn main() {
         // Clean
         if !Command::new("make")
             .arg("clean-all")
+            .env("PATH", original_path)
             .env("MEDIASOUP_OUT_DIR", &mediasoup_out_dir)
             .spawn()
             .expect("Failed to start")
diff --git a/worker/scripts/getmake.py b/worker/scripts/getmake.py
index c6c0dbb9a3..50ec9ea7f1 100644
--- a/worker/scripts/getmake.py
+++ b/worker/scripts/getmake.py
@@ -1,10 +1,21 @@
-import io, hashlib, tarfile, urllib.request
+import argparse, io, hashlib, tarfile, urllib.request
+
+argParser = argparse.ArgumentParser()
+
+argParser.add_argument(
+  '--dir',
+  type=str,
+  required=True,
+  help='absolute path of the directoy in which fetched content will be placed'
+)
+
+args = argParser.parse_args()
 
 def get(url, digest):
   data = urllib.request.urlopen(url).read()
   assert hashlib.sha256(data).hexdigest() == digest
   tar = tarfile.open(fileobj=io.BytesIO(data))
-  tar.extractall('worker/out/msys')
+  tar.extractall(args.dir)
   tar.close()
 
 get('https://sourceforge.net/projects/mingw/files/MSYS/Base/msys-core/msys-1.0.19-1/msysCORE-1.0.19-1-msys-1.0.19-bin.tar.xz/download', '8c4157d739a460f85563bc4451e9f1bbd42b13c4f63770d43b9f45a781f07858')