diff --git a/coding/multilang_utf8_string.cpp b/coding/multilang_utf8_string.cpp
index d63413555c..84353d0cae 100644
--- a/coding/multilang_utf8_string.cpp
+++ b/coding/multilang_utf8_string.cpp
@@ -81,3 +81,25 @@ bool StringUtf8Multilang::GetString(int8_t lang, string & utf8s) const
 
   return false;
 }
+
+namespace
+{
+struct Printer
+{
+  string & m_out;
+  Printer(string & out) : m_out(out) {}
+  bool operator()(int8_t code, string const & name) const
+  {
+    m_out += string(StringUtf8Multilang::GetLangByCode(code)) + string(":") + name + " ";
+    return true;
+  }
+};
+} // namespace
+
+string DebugPrint(StringUtf8Multilang const & s)
+{
+  string out;
+  Printer printer(out);
+  s.ForEachRef(printer);
+  return out;
+}
diff --git a/coding/multilang_utf8_string.hpp b/coding/multilang_utf8_string.hpp
index 2d40a8bf77..938b7fd1cf 100644
--- a/coding/multilang_utf8_string.hpp
+++ b/coding/multilang_utf8_string.hpp
@@ -92,20 +92,4 @@ public:
   }
 };
 
-string DebugPrint(StringUtf8Multilang const & s)
-{
-  string out;
-  struct Printer
-  {
-    string & m_out;
-    Printer(string & out) : m_out(out) {}
-    bool operator()(int8_t code, string const & name) const
-    {
-      m_out += string(StringUtf8Multilang::GetLangByCode(code)) + string(":") + name + " ";
-      return true;
-    }
-  } printer(out);
-
-  s.ForEachRef(printer);
-  return out;
-}
+string DebugPrint(StringUtf8Multilang const & s);
diff --git a/coding/value_opt_string.hpp b/coding/value_opt_string.hpp
index 3aff7f79b3..02d066771b 100644
--- a/coding/value_opt_string.hpp
+++ b/coding/value_opt_string.hpp
@@ -73,7 +73,7 @@ public:
   }
 };
 
-string DebugPrint(StringNumericOptimal const & s)
+inline string DebugPrint(StringNumericOptimal const & s)
 {
   return s.Get();
 }