diff --git a/src/Package/Library/zstd.php b/src/Package/Library/zstd.php
index 8cbf7aa6..f12bf3e0 100644
--- a/src/Package/Library/zstd.php
+++ b/src/Package/Library/zstd.php
@@ -17,7 +17,7 @@ class zstd
     public function buildWin(LibraryPackage $package): void
     {
         WindowsCMakeExecutor::create($package)
-            ->setRootDir("{$package->getSourceDir()}/build/cmake")
+            ->setWorkingDir("{$package->getSourceDir()}/build/cmake")
             ->setBuildDir("{$package->getSourceDir()}/build/cmake/build")
             ->addConfigureArgs(
                 '-DZSTD_BUILD_STATIC=ON',
diff --git a/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php b/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
index 9e097819..1f057f12 100644
--- a/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
+++ b/src/StaticPHP/Runtime/Executor/WindowsCMakeExecutor.php
@@ -176,6 +176,12 @@ class WindowsCMakeExecutor extends Executor
         return implode(' ', array_merge($this->configure_args, $this->getDefaultCMakeArgs()));
     }
 
+    public function setWorkingDir(string $dir): static
+    {
+        $this->cmd = $this->cmd->cd($dir);
+        return $this;
+    }
+
     /**
      * Returns the default CMake args.
      */
@@ -207,12 +213,12 @@ class WindowsCMakeExecutor extends Executor
     private function initBuildDir(): void
     {
         if ($this->build_dir === null) {
-            $this->build_dir = "{$this->package->getSourceDir()}\\build";
+            $this->build_dir = "{$this->package->getSourceRoot()}\\build";
         }
     }
 
     private function initCmd(): void
     {
-        $this->cmd = cmd()->cd($this->package->getSourceDir());
+        $this->cmd = cmd()->cd($this->package->getSourceRoot());
     }
 }