diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index f00d5ff3..1116e1ca 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -1,11 +1,11 @@
-name: Windows
+name: macOS
 
 on: [push]
 
 jobs:
   build:
 
-    runs-on: windows-latest
+    runs-on: macos-latest
 
     steps:
     - uses: actions/checkout@v1
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 1116e1ca..ea467fb6 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -1,18 +1,18 @@
-name: macOS
+name: Windows
 
 on: [push]
 
 jobs:
   build:
 
-    runs-on: macos-latest
+    runs-on: windows-latest
 
     steps:
     - uses: actions/checkout@v1
     - name: prepare
       run: mkdir build
     - name: cmake
-      run: cd build ; cmake ..
+      run: cd build ; cmake .. -G "Visual Studio 16 2019"
     - name: build
       run: make -C build
     - name: test