diff --git a/Cargo.toml b/Cargo.toml
index de6f874..8e960f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "secp256k1"
-version = "0.8.1"
+version = "0.8.2"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"
diff --git a/src/macros.rs b/src/macros.rs
index 92eccbf..4318ae0 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -60,7 +60,7 @@ macro_rules! impl_array_newtype {
                     let mut ret: $thing = mem::uninitialized();
                     copy_nonoverlapping(self.as_ptr(),
                                         ret.as_mut_ptr(),
-                                        mem::size_of::<$thing>());
+                                        $len);
                     ret
                 }
             }