diff --git a/nel/include/nel/misc/ucstring.h b/nel/include/nel/misc/ucstring.h
index 8cedb04ec..5f0616d8f 100644
--- a/nel/include/nel/misc/ucstring.h
+++ b/nel/include/nel/misc/ucstring.h
@@ -128,17 +128,7 @@ public:
 	}
 
 	/// Converts the controlled ucstring to a string str
-	void toString (std::string &str) const
-	{
-		str.resize (size ());
-		for (uint i = 0; i < str.size (); i++)
-		{
-			if (operator[](i) > 255)
-				str[i] = '?';
-			else
-				str[i] = (char) operator[](i);
-		}
-	}
+	void toString(std::string &str) const;
 
 	/// Converts the controlled ucstring and returns the resulting string
 	std::string toString () const
diff --git a/nel/src/misc/ucstring.cpp b/nel/src/misc/ucstring.cpp
index 5d7112114..df8f52406 100644
--- a/nel/src/misc/ucstring.cpp
+++ b/nel/src/misc/ucstring.cpp
@@ -17,6 +17,18 @@
 #include "stdmisc.h"
 #include "nel/misc/ucstring.h"
 
+void ucstring::toString(std::string &str) const
+{
+	str.resize(size());
+	for (uint i = 0; i < str.size (); i++)
+	{
+		if (operator[](i) > 255)
+			str[i] = '?';
+		else
+			str[i] = (char) operator[](i);
+	}
+}
+
 std::string ucstring::toUtf8() const
 {
 	std::string	res;