diff --git a/Cargo.toml b/Cargo.toml
index dcfa74b50c..55844e7fd1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -315,7 +315,7 @@ all-armhf = [
     ]
 
 ## All features that are compiled and tested for mingw64
-all-mingw64 = [ "balloon", "crash_report", "gpu", "haxm", "slirp", "stats" ]
+all-mingw64 = [ "audio", "balloon", "crash_report", "gpu", "haxm", "slirp", "stats" ]
 
 ## All features that are compiled and tested for msvc64
 all-msvc64 = [ "all-mingw64" ]
diff --git a/devices/src/pci/ac97_bus_master/sys/windows.rs b/devices/src/pci/ac97_bus_master/sys/windows.rs
index 64cb6f0377..eeb75f3fdf 100644
--- a/devices/src/pci/ac97_bus_master/sys/windows.rs
+++ b/devices/src/pci/ac97_bus_master/sys/windows.rs
@@ -290,7 +290,7 @@ impl Drop for Ac97BusMaster {
     fn drop(&mut self) {
         if let Some(exit_event) = &self.sys.exit_event {
             exit_event
-                .write(1)
+                .signal()
                 .expect("Failed to write to exit_event in Ac97BusMaster");
         }
 
diff --git a/devices/src/virtio/snd/common_backend/stream_info.rs b/devices/src/virtio/snd/common_backend/stream_info.rs
index 07661472b1..4c9ceef877 100644
--- a/devices/src/virtio/snd/common_backend/stream_info.rs
+++ b/devices/src/virtio/snd/common_backend/stream_info.rs
@@ -333,6 +333,8 @@ impl StreamInfo {
     }
 }
 
+// TODO(b/246997900): Get these new tests to run on Windows.
+#[cfg(unix)]
 #[cfg(test)]
 mod tests {
     use audio_streams::NoopStreamSourceGenerator;