diff --git a/src/lib/diff/tree-diff-application.hpp b/src/lib/diff/tree-diff-application.hpp
index 8c3415d38..642cd9d09 100644
--- a/src/lib/diff/tree-diff-application.hpp
+++ b/src/lib/diff/tree-diff-application.hpp
@@ -379,7 +379,7 @@ namespace diff{
           using Target = typename TreeDiffTraits<TAR>::Ret;
           
           Target target = mutatorBinding (subject_);
-          buildMutator (target)->init();
+          buildMutator(target)->init();
           TreeDiffMutatorBinding::scopeManger_ = &scopes_;
           TreeDiffMutatorBinding::treeMutator_ = &scopes_.currentScope();
           REQUIRE (this->treeMutator_);
diff --git a/src/lib/diff/tree-mutator-collection-binding.hpp b/src/lib/diff/tree-mutator-collection-binding.hpp
index e2c1654fc..a556519fb 100644
--- a/src/lib/diff/tree-mutator-collection-binding.hpp
+++ b/src/lib/diff/tree-mutator-collection-binding.hpp
@@ -654,6 +654,7 @@ namespace diff{
                              {
                                mutateInPlace (target.data.get<Rec>())
                                    .buildMutator(buff);
+                               buff.get()->init();
                                return true;
                              }
                            else
diff --git a/tests/library/diff/tree-mutator-test.cpp b/tests/library/diff/tree-mutator-test.cpp
index f1104fec4..34ceb4b87 100644
--- a/tests/library/diff/tree-mutator-test.cpp
+++ b/tests/library/diff/tree-mutator-test.cpp
@@ -89,6 +89,8 @@ namespace test{
                << " type="<< typeStr(mutator)
                << endl;
           
+          mutator.init();
+          
           CHECK (isnil (localData));
           string testValue{"that would be acceptable"};
           mutator.assignElm ({"lore", testValue});
@@ -120,6 +122,8 @@ namespace test{
                << " type="<< typeStr(mutator)
                << endl;
           
+          mutator.init();
+          
           CHECK (isnil (values));
           CHECK (mutator.matchSrc (GenNode("a")));
                  mutator.skipSrc (GenNode("a"));