diff --git a/utest/DArenaIterator.test.cpp b/utest/DArenaIterator.test.cpp
index 150c8dd..a42fc46 100644
--- a/utest/DArenaIterator.test.cpp
+++ b/utest/DArenaIterator.test.cpp
@@ -263,7 +263,7 @@ namespace xo {
 
                 /* valid iterator can be advanced + reaches end */
                 {
-                    ix.next();
+                    ++ix; //ix.next();
 
                     REQUIRE(arena.error_count_ == 0);
                     REQUIRE(ix == end_ix);
diff --git a/utest/DX1CollectorIterator.test.cpp b/utest/DX1CollectorIterator.test.cpp
index 159986a..941d1d0 100644
--- a/utest/DX1CollectorIterator.test.cpp
+++ b/utest/DX1CollectorIterator.test.cpp
@@ -193,7 +193,7 @@ namespace xo {
                 }
 
                 {
-                    ix.next();
+                    ++ix;
 
                     REQUIRE(ix == end_ix);
                 }