diff --git a/shard.yml b/shard.yml
index 6e95219..3c38bff 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: openssl_ext
-version: 0.1.1
+version: 0.1.3
 
 authors:
   - Connor Imrie <3436576+CImrie@users.noreply.github.com>
diff --git a/src/openssl_ext/pkey.cr b/src/openssl_ext/pkey.cr
index 12bd171..32a8fc0 100644
--- a/src/openssl_ext/pkey.cr
+++ b/src/openssl_ext/pkey.cr
@@ -127,7 +127,7 @@ module OpenSSL
           len = key_size
         end
 
-        buffer.copy_from(pwd.to_slice.pointer(len), len)
+        buffer.copy_from(pwd.to_slice.to_unsafe, len)
 
         return len
       }