diff --git a/base2k/src/znx_base.rs b/base2k/src/znx_base.rs
index c8636f3..f618446 100644
--- a/base2k/src/znx_base.rs
+++ b/base2k/src/znx_base.rs
@@ -107,7 +107,7 @@ where
 {
     fn zero(&mut self) {
         unsafe {
-            std::ptr::write_bytes(self.as_mut_ptr(), 0, self.sl() * self.poly_count());
+            std::ptr::write_bytes(self.as_mut_ptr(), 0, self.n() * self.poly_count());
         }
     }