Fix generated code
diff --git a/grpc.def b/grpc.def
index e387c8b..c660d36 100644
--- a/grpc.def
+++ b/grpc.def
@@ -182,6 +182,7 @@
     grpc_slice_buffer_take_first
     grpc_slice_buffer_undo_take_first
     gpr_malloc
+    gpr_zalloc
     gpr_free
     gpr_realloc
     gpr_malloc_aligned