diff --git a/src/memory/mod.rs b/src/memory/mod.rs
index cc25e2e..9b67d8b 100644
--- a/src/memory/mod.rs
+++ b/src/memory/mod.rs
@@ -200,10 +200,9 @@ impl From<ElfSectionFlags> for MemoryAttr {
     }
 }
 
-use super::*;
-
 pub mod test {
     pub fn cow() {
+        use super::*;
         use ucore_memory::cow::test::test_with;
         test_with(&mut active_table());
     }