diff --git a/indexer/feature_decl.cpp b/indexer/feature_decl.cpp
index 063b1afd89..e3df79d2f6 100644
--- a/indexer/feature_decl.cpp
+++ b/indexer/feature_decl.cpp
@@ -6,6 +6,6 @@
 string DebugPrint(FeatureID const & id)
 {
   ostringstream ss;
-  ss << "{ " << id.m_mwmId << ", " << id.m_ind << " }";
+  ss << "{ " << DebugPrint(id.m_mwmId) << ", " << id.m_ind << " }";
   return ss.str();
 }
diff --git a/indexer/mwm_set.cpp b/indexer/mwm_set.cpp
index d176473a9b..7f1b05718c 100644
--- a/indexer/mwm_set.cpp
+++ b/indexer/mwm_set.cpp
@@ -8,6 +8,8 @@
 #include "base/stl_add.hpp"
 
 #include "std/algorithm.hpp"
+#include "std/sstream.hpp"
+
 
 using platform::CountryFile;
 using platform::LocalCountryFile;
@@ -24,6 +26,16 @@ MwmInfo::MwmTypeT MwmInfo::GetType() const
   return COASTS;
 }
 
+string DebugPrint(MwmSet::MwmId const & id)
+{
+  ostringstream ss;
+  if (id.m_info.get())
+    ss << "MwmId [" << id.m_info->GetCountryName() << "]";
+  else
+    ss << "MwmId [invalid]";
+  return ss.str();
+}
+
 MwmSet::MwmHandle::MwmHandle() : m_mwmSet(nullptr), m_mwmId(), m_value(nullptr) {}
 
 MwmSet::MwmHandle::MwmHandle(MwmSet & mwmSet, MwmId const & mwmId)
diff --git a/indexer/mwm_set.hpp b/indexer/mwm_set.hpp
index 72ad83be95..3195955529 100644
--- a/indexer/mwm_set.hpp
+++ b/indexer/mwm_set.hpp
@@ -10,7 +10,6 @@
 #include "base/macros.hpp"
 
 #include "std/deque.hpp"
-#include "std/iostream.hpp"
 #include "std/map.hpp"
 #include "std/mutex.hpp"
 #include "std/shared_ptr.hpp"
@@ -18,6 +17,7 @@
 #include "std/utility.hpp"
 #include "std/vector.hpp"
 
+
 /// Information about stored mwm.
 class MwmInfo
 {
@@ -97,14 +97,7 @@ public:
     inline bool operator!=(MwmId const & rhs) const { return !(*this == rhs); }
     inline bool operator<(MwmId const & rhs) const { return GetInfo() < rhs.GetInfo(); }
 
-    friend ostream & operator<<(ostream & os, MwmId const & id)
-    {
-      if (id.m_info.get())
-        os << "MwmId [" << id.m_info->GetCountryName() << "]";
-      else
-        os << "MwmId [invalid]";
-      return os;
-    }
+    friend string DebugPrint(MwmId const & id);
 
   private:
     shared_ptr<MwmInfo> m_info;