diff --git a/src/engine/strat_engine/thinpool/filesystem.rs b/src/engine/strat_engine/thinpool/filesystem.rs
index ae6c66b..ffcf962 100644
--- a/src/engine/strat_engine/thinpool/filesystem.rs
+++ b/src/engine/strat_engine/thinpool/filesystem.rs
@@ -225,6 +225,6 @@ pub fn fs_usage(mount_point: &Path) -> EngineResult<(Bytes, Bytes)> {
     // Upcast to u64.
     let f_bsize = stat.block_size() as u64;
 
-    let blocks = stat.blocks();
-    Ok((Bytes(f_bsize * blocks), Bytes(f_bsize * (blocks - stat.blocks_free()))))
+    let blocks = stat.blocks() as u64;
+    Ok((Bytes(f_bsize * blocks), Bytes(f_bsize * (blocks - stat.blocks_free() as u64))))
 }