diff --git a/src/io/read_buf.rs b/src/io/read_buf.rs
index c470e24..6226c6f 100644
--- a/src/io/read_buf.rs
+++ b/src/io/read_buf.rs
@@ -414,9 +414,3 @@ impl Drop for ReadBuf {
         self.release();
     }
 }
-
-#[test]
-fn size_assertion() {
-    assert_eq!(std::mem::size_of::<ReadBufPool>(), 8);
-    assert_eq!(std::mem::size_of::<ReadBuf>(), 24);
-}
diff --git a/tests/async_fd/io.rs b/tests/async_fd/io.rs
index 8bd7126..bea3764 100644
--- a/tests/async_fd/io.rs
+++ b/tests/async_fd/io.rs
@@ -44,6 +44,12 @@ fn try_clone() {
     assert_eq!(&buf.data, DATA);
 }
 
+#[test]
+fn read_buf_pool_size_assertion() {
+    assert_eq!(std::mem::size_of::<ReadBufPool>(), 8);
+    assert_eq!(std::mem::size_of::<ReadBuf>(), 24);
+}
+
 #[test]
 fn read_read_buf_pool() {
     require_kernel!(5, 19);