diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 246289a..281d8cb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -14,28 +14,17 @@ jobs:
         os:
           - macos-latest
           - ubuntu-latest
-          - windows-latest
+          - windows-2019
     steps:
       - name: Fetch code
         uses: actions/checkout@v1
         with:
           submodules: true
 
-      - name: Install dependencies
-        run: yarn install --ignore-scripts
-
-      - name: Build addon
-        if: runner.os != 'Linux'
-        run: make build-addon
-
-      - name: Build addon
-        if: runner.os == 'Linux'
-        run: make build-addon-linux
-
       - name: Get minimal Node.js version from package.json (Linux & macOS)
         id: node-version-nix
         if: runner.os != 'Windows'
-        run: echo "::set-output name=version::$(node -p 'require("./package.json").engines.node.match(/(\d.*)$/)[0]')"
+        run: echo "::set-output name=version::$(node -p 'require("./package.json").engines.node.match(/(\d+)\..*$/)[1]')"
 
       - name: Use Node.js ${{ steps.node-version-nix.outputs.version }} (Linux & macOS)
         if: runner.os != 'Windows'
@@ -46,7 +35,7 @@ jobs:
       - name: Get minimal Node.js version from package.json (Windows)
         id: node-version-win
         if: runner.os == 'Windows'
-        run: echo "::set-output name=version::$(node -p 'require(\"./package.json\").engines.node.match(/(\d.*)$/)[0]')"
+        run: echo "::set-output name=version::$(node -p 'require(\"./package.json\").engines.node.match(/(\d+)\..*$/)[1]')"
 
       - name: Use Node.js ${{ steps.node-version-win.outputs.version }} (Windows)
         if: runner.os == 'Windows'
@@ -54,6 +43,17 @@ jobs:
         with:
           node-version: ${{ steps.node-version-win.outputs.version }}
 
+      - name: Install dependencies
+        run: yarn install --ignore-scripts
+
+      - name: Build addon
+        if: runner.os != 'Linux'
+        run: make build-addon
+
+      - name: Build addon
+        if: runner.os == 'Linux'
+        run: make build-addon-linux
+
       - name: Run tests for addon
         run: make test-tap
 
diff --git a/src/addon.cc b/src/addon.cc
index 3ec1cf6..5cfa410 100644
--- a/src/addon.cc
+++ b/src/addon.cc
@@ -12,7 +12,6 @@ class KeccakWrapper : public Napi::ObjectWrap<KeccakWrapper> {
 
  private:
   KeccakWidth1600_SpongeInstance sponge;
-  static Napi::FunctionReference constructor;
 
   Napi::Value Initialize(const Napi::CallbackInfo& info);
   Napi::Value Absorb(const Napi::CallbackInfo& info);
@@ -21,8 +20,6 @@ class KeccakWrapper : public Napi::ObjectWrap<KeccakWrapper> {
   Napi::Value Copy(const Napi::CallbackInfo& info);
 };
 
-Napi::FunctionReference KeccakWrapper::constructor;
-
 Napi::Object KeccakWrapper::Init(Napi::Env env) {
   Napi::Function func =
       DefineClass(env,
@@ -36,9 +33,6 @@ Napi::Object KeccakWrapper::Init(Napi::Env env) {
                       InstanceMethod("copy", &KeccakWrapper::Copy),
                   });
 
-  constructor = Napi::Persistent(func);
-  constructor.SuppressDestruct();
-
   return func;
 }