diff --git a/src/command.cpp b/src/command.cpp
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -696,7 +696,7 @@ CommandCost DoCommandPInternal(TileIndex
 		if (!_networking || _generating_world || (cmd & CMD_NETWORK_COMMAND) != 0) {
 			/* Log the failed command as well. Just to be able to be find
 			 * causes of desyncs due to bad command test implementations. */
-			DEBUG(desync, 1, "cmdf: %08x; %02x; %02x; %06x; %08x; %08x; %08x; \"%s\" (%s)", _date, _date_fract, (int)_current_company, tile, p1, p2, cmd & ~CMD_NETWORK_COMMAND, text.c_str(), GetCommandName(cmd));
+			Debug(desync, 1, "cmdf: {:08x}; {:02x}; {:02x}; {:06x}; {:08x}; {:08x}; {:08x}; \"{}\" ({})", _date, _date_fract, (int)_current_company, tile, p1, p2, cmd & ~CMD_NETWORK_COMMAND, text, GetCommandName(cmd));
 		}
 		cur_company.Restore();
 		return_dcpi(res);
@@ -716,7 +716,7 @@ CommandCost DoCommandPInternal(TileIndex
 		 * reset the storages as we've not executed the command. */
 		return_dcpi(CommandCost());
 	}
-	DEBUG(desync, 1, "cmd: %08x; %02x; %02x; %06x; %08x; %08x; %08x; \"%s\" (%s)", _date, _date_fract, (int)_current_company, tile, p1, p2, cmd & ~CMD_NETWORK_COMMAND, text.c_str(), GetCommandName(cmd));
+	Debug(desync, 1, "cmd: {:08x}; {:02x}; {:02x}; {:06x}; {:08x}; {:08x}; {:08x}; \"{}\" ({})", _date, _date_fract, (int)_current_company, tile, p1, p2, cmd & ~CMD_NETWORK_COMMAND, text, GetCommandName(cmd));
 
 	/* Actually try and execute the command. If no cost-type is given
 	 * use the construction one */