diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index 817e309cf77..6b6ec7147b3 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -532,7 +532,7 @@ impl<T> SliceExt for [T] {
 
     #[inline]
     fn chunks_mut(&mut self, chunk_size: usize) -> ChunksMut<T> {
-        assert!(chunk_size > 0);
+        assert!(chunk_size != 0);
         ChunksMut { v: self, chunk_size: chunk_size }
     }