diff --git a/leopard/leopard.nim b/leopard/leopard.nim
index 6e60bef..4bac400 100644
--- a/leopard/leopard.nim
+++ b/leopard/leopard.nim
@@ -73,7 +73,7 @@ func encode*(
 
   let
     res = leoEncode(
-      self.bufSize.cuint,
+      self.bufSize.culonglong,
       self.buffers.cuint,
       self.parity.cuint,
       self.workBufferCount.cuint,
@@ -144,7 +144,7 @@ func decode*(
 
   let
     res = leo_decode(
-      self.bufSize.cuint,
+      self.bufSize.culonglong,
       self.buffers.cuint,
       self.parity.cuint,
       self.decodeBufferCount.cuint,
@@ -206,6 +206,9 @@ proc init[TT: Leo](
   if parity > buffers:
     return err("number of parity buffers cannot exceed number of data buffers!")
 
+  if buffers + parity > 65536:
+    return err("number of parity and data buffers cannot exceed 65536!")
+
   once:
     # First, attempt to init the leopard library,
     # this happens only once for all threads and