diff --git a/justfile b/justfile
index 1b903c9..2cc8636 100644
--- a/justfile
+++ b/justfile
@@ -28,7 +28,7 @@ test-integration *args:
 
     # use a randomized project name to allow simultaneous test runs
     project="platform-lib-it-$(openssl rand -hex 4)"
-    dc="docker-compose -f docker/docker-compose.test.yml -p ${project}"
+    dc="docker compose -f docker/docker-compose.test.yml -p ${project}"
 
     function cleanup() {
         ${dc} logs --no-color > test-integration-${project}.log
diff --git a/pkg/rsstorage/servers/file/server.go b/pkg/rsstorage/servers/file/server.go
index 552f8c7..bc26630 100644
--- a/pkg/rsstorage/servers/file/server.go
+++ b/pkg/rsstorage/servers/file/server.go
@@ -13,7 +13,6 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
-	"syscall"
 	"time"
 
 	"github.com/c2h5oh/datasize"
@@ -118,17 +117,22 @@ func (s *StorageServer) Type() types.StorageType {
 	return rsstorage.StorageTypeFile
 }
 
+type StatfsData struct {
+	Bfree  uint64
+	Bsize  int64
+	Blocks uint64
+}
+
 func (s *StorageServer) CalculateUsage() (types.Usage, error) {
 	start := time.Now()
 
-	fs := syscall.Statfs_t{}
-	err := syscall.Statfs(s.dir, &fs)
+	stat, err := Statfs(s.dir)
 	if err != nil {
 		return types.Usage{}, fmt.Errorf("error calculating filesystem capacity for %s: %s.\n", s.dir, err)
 	}
 
-	all := fs.Blocks * uint64(fs.Bsize)
-	free := fs.Bfree * uint64(fs.Bsize)
+	all := stat.Blocks * uint64(stat.Bsize)
+	free := stat.Bfree * uint64(stat.Bsize)
 
 	timeInfo := time.Now()
 	elapsed := timeInfo.Sub(start)
diff --git a/pkg/rsstorage/servers/file/server_unix.go b/pkg/rsstorage/servers/file/server_unix.go
new file mode 100644
index 0000000..0827463
--- /dev/null
+++ b/pkg/rsstorage/servers/file/server_unix.go
@@ -0,0 +1,22 @@
+//go:build !windows
+
+// Copyright (C) 2024 by RStudio, PBC.
+
+package file
+
+import (
+	"syscall"
+)
+
+func Statfs(path string) (*StatfsData, error) {
+	fs := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &fs)
+	if err != nil {
+		return nil, err
+	}
+	return &StatfsData{
+		Bsize:  fs.Bsize,
+		Blocks: fs.Blocks,
+		Bfree:  fs.Bfree,
+	}, nil
+}
diff --git a/pkg/rsstorage/servers/file/server_windows.go b/pkg/rsstorage/servers/file/server_windows.go
new file mode 100644
index 0000000..da40806
--- /dev/null
+++ b/pkg/rsstorage/servers/file/server_windows.go
@@ -0,0 +1,9 @@
+package file
+
+// Copyright (C) 2024 by RStudio, PBC.
+
+import "errors"
+
+func Statfs(path string) (*StatfsData, error) {
+	return nil, errors.New("Statfs is not supported on Windows")
+}