diff --git a/include/wsrep/key.hpp b/include/wsrep/key.hpp
index 5296976..85c266c 100644
--- a/include/wsrep/key.hpp
+++ b/include/wsrep/key.hpp
@@ -89,6 +89,7 @@ namespace wsrep
 
     typedef std::vector<wsrep::key> key_array;
 
+    std::ostream& operator<<(std::ostream&, enum wsrep::key::type);
     std::ostream& operator<<(std::ostream&, const wsrep::key&);
 }
 
diff --git a/src/key.cpp b/src/key.cpp
index 1910d4b..fb94fef 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -39,6 +39,20 @@ namespace
     }
 }
 
+std::ostream& wsrep::operator<<(std::ostream& os,
+                                enum wsrep::key::type key_type)
+{
+    switch (key_type)
+    {
+    case wsrep::key::shared: os << "shared"; break;
+    case wsrep::key::reference: os << "reference"; break;
+    case wsrep::key::update: os << "update"; break;
+    case wsrep::key::exclusive: os << "exclusive"; break;
+    default: os << "unknown"; break;
+    }
+    return os;
+}
+
 std::ostream& wsrep::operator<<(std::ostream& os, const wsrep::key& key)
 {
     os << "type: " << key.type();
diff --git a/src/transaction.cpp b/src/transaction.cpp
index 277a16b..e461907 100644
--- a/src/transaction.cpp
+++ b/src/transaction.cpp
@@ -1821,5 +1821,5 @@ void wsrep::transaction::debug_log_key_append(const wsrep::key& key) const
                     "key_append: "
                     << "trx_id: "
                     << int64_t(id().get())
-                    << " append key: " << key);
+                    << " append key:\n" << key);
 }