diff --git a/code/nel/src/misc/common.cpp b/code/nel/src/misc/common.cpp
index 3f39ab86a..1ae3f44fb 100644
--- a/code/nel/src/misc/common.cpp
+++ b/code/nel/src/misc/common.cpp
@@ -1535,7 +1535,7 @@ static bool openDocWithExtension (const std::string &document, const std::string
 
 	if (command.empty())
 	{
-		nlwarning("Unable to open %s", document);
+		nlwarning("Unable to open %s", document.c_str());
 		return false;
 	}