diff --git a/go/workspace/workspace.go b/go/workspace/workspace.go
index f8f2ef9f..6311b3f4 100644
--- a/go/workspace/workspace.go
+++ b/go/workspace/workspace.go
@@ -28,7 +28,7 @@ func getPathFSID(dir string) (uint64, error) {
 	}
 	switch x := st.Sys().(type) {
 	case *syscall.Stat_t:
-		return x.Dev, nil
+		return uint64(x.Dev), nil
 	default:
 		return 0, fmt.Errorf("unsupported operating system (got stat type %+v)", st.Sys())
 	}