diff --git a/xpcPlugin/DataManager.cpp b/xpcPlugin/DataManager.cpp
index 23a07b5..42048e5 100644
--- a/xpcPlugin/DataManager.cpp
+++ b/xpcPlugin/DataManager.cpp
@@ -313,12 +313,12 @@ namespace XPC
 		}
 		if (!xdref) // DREF does not exist
 		{
-			Log::FormatLine(LOG_ERROR, "DMAN", "ERROR: invalid DREF %s", dref);
+			Log::FormatLine(LOG_ERROR, "DMAN", "ERROR: invalid DREF %s", dref.c_str());
 			return 0;
 		}
 
 		XPLMDataTypeID dataType = XPLMGetDataRefTypes(xdref);
-		Log::FormatLine(LOG_INFO, "DMAN", "Get DREF %s (x:%X) Type: %i", dref, xdref, dataType);
+		Log::FormatLine(LOG_INFO, "DMAN", "Get DREF %s (x:%X) Type: %i", dref.c_str(), xdref, dataType);
 		// XPLMDataTypeID is a bit flag, so it may contain more than one of the
 		// following types. We prefer types as close to float as possible.
 		if ((dataType & 2) == 2) // Float
@@ -518,7 +518,7 @@ namespace XPC
 		if (!xdref)
 		{
 			// DREF does not exist
-			Log::FormatLine(LOG_ERROR, "DMAN", "ERROR: invalid DREF %s", dref);
+			Log::FormatLine(LOG_ERROR, "DMAN", "ERROR: invalid DREF %s", dref.c_str());
 			return;
 		}
 		if (isnan(values[0]))
diff --git a/xpcPlugin/Message.cpp b/xpcPlugin/Message.cpp
index bcc5db5..897dda4 100644
--- a/xpcPlugin/Message.cpp
+++ b/xpcPlugin/Message.cpp
@@ -121,7 +121,7 @@ namespace XPC
 		{
 			Log::WriteLine(LOG_DEBUG, "DBUG", ss.str());
             std::string dref((char*)buffer + 6, buffer[5]);
-            Log::FormatLine(LOG_DEBUG, "DBUG", "    DREF (size %i) = %s", dref.length(), dref);
+            Log::FormatLine(LOG_DEBUG, "DBUG", "    DREF (size %i) = %s", dref.length(), dref.c_str());
             ss.str("");
             int values = buffer[6 + buffer[5]];
             ss << "    Values(size " << values << ") =";
@@ -140,7 +140,7 @@ namespace XPC
             {
                 std::string dref((char*)buffer + cur + 1, buffer[cur]);
                 Log::FormatLine(LOG_DEBUG, "DBUG", "    #%i/%i (size:%i) %s",
-					i + 1, buffer[5], dref.length(), dref);
+					i + 1, buffer[5], dref.length(), dref.c_str());
                 cur += 1 + buffer[cur];
             }
             break;
diff --git a/xpcPlugin/MessageHandlers.cpp b/xpcPlugin/MessageHandlers.cpp
index 4f7c3d3..d72b8a8 100644
--- a/xpcPlugin/MessageHandlers.cpp
+++ b/xpcPlugin/MessageHandlers.cpp
@@ -89,7 +89,7 @@ namespace XPC
 		// Set current connection
 		sockaddr sourceaddr = msg.GetSource();
 		connectionKey = UDPSocket::GetHost(&sourceaddr);
-		Log::FormatLine(LOG_INFO, "MSGH", "Handling message from %s", connectionKey);
+		Log::FormatLine(LOG_INFO, "MSGH", "Handling message from %s", connectionKey.c_str());
 		std::map<std::string, ConnectionInfo>::iterator conn = connections.find(connectionKey);
 		if (conn == connections.end()) // New connection
 		{
@@ -102,13 +102,13 @@ namespace XPC
 			connection.getdCount = 0;
 			connections[connectionKey] = connection;
 			Log::FormatLine(LOG_DEBUG, "MSGH", "New connection. ID=%u, Remote=%s",
-				connection.id, connectionKey);
+				connection.id, connectionKey.c_str());
 		}
 		else
 		{
 			connection = (*conn).second;
 			Log::FormatLine(LOG_DEBUG, "MSGH", "Existing connection. ID=%u, Remote=%s",
-				connection.id, connectionKey);
+				connection.id, connectionKey.c_str());
 		}
 
 		msg.PrintToLog();
@@ -417,7 +417,7 @@ namespace XPC
 			pos += 4 * valueCount;
 
 			DataManager::Set(dref, values, valueCount);
-			Log::FormatLine(LOG_DEBUG, "DREF", "Set %d values for %s", valueCount, dref);
+			Log::FormatLine(LOG_DEBUG, "DREF", "Set %d values for %s", valueCount, dref.c_str());
 		}
 		if (pos != size)
 		{