1 files changed, 1 insertions, 1 deletions
diff --git a/src/op.h b/src/op.h
index b27384ec..2c15186b 100644
--- a/src/op.h
+++ b/src/op.h
@@ -298,7 +298,7 @@ private:
   friend class boost::serialization::access;
 
   template<class Archive>
-  void serialize(Archive & ar, const unsigned int /* version */) {
+  void serialize(Archive& ar, const unsigned int /* version */) {
     ar & refc;
     ar & kind;
     if (Archive::is_loading::value || ! left_ || left_->kind != FUNCTION) {