diff --git a/src/cryptonote_basic/cryptonote_boost_serialization.h b/src/cryptonote_basic/cryptonote_boost_serialization.h
index 51e790dde..940932af5 100644
--- a/src/cryptonote_basic/cryptonote_boost_serialization.h
+++ b/src/cryptonote_basic/cryptonote_boost_serialization.h
@@ -342,7 +342,7 @@ namespace boost
     if (x.rangeSigs.empty())
     {
       a & x.bulletproofs;
-      if (ver >= 2)
+      if (ver >= 2u)
         a & x.bulletproofs_plus;
     }
     a & x.MGs;
@@ -372,7 +372,7 @@ namespace boost
     if (x.p.rangeSigs.empty())
     {
       a & x.p.bulletproofs;
-      if (ver >= 2)
+      if (ver >= 2u)
         a & x.p.bulletproofs_plus;
     }
     a & x.p.MGs;