diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index d92113e..5ed5231 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -15,10 +15,12 @@ jobs:
     continue-on-error: ${{matrix.experimental}}
     
     strategy:
+      fail-fast: false
       matrix:
         os:
           - ubuntu
           - macos
+          - windows
         
         ruby:
           - "3.0"
diff --git a/ext/libev/ev.c b/ext/libev/ev.c
index 1ed4726..8759ee5 100644
--- a/ext/libev/ev.c
+++ b/ext/libev/ev.c
@@ -2481,7 +2481,7 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
 #ifdef _WIN32
           WSABUF buf;
           DWORD sent;
-          buf.buf = &buf;
+          buf.buf = (char *)&buf;
           buf.len = 1;
           WSASend (EV_FD_TO_WIN32_HANDLE (evpipe [1]), &buf, 1, &sent, 0, 0, 0);
 #else