diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index c79d7f5541..d4aee4b0ed 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -19,6 +19,8 @@
 #include <float.h>
 #include <assert.h>
 #include <regex>
+#include <charconv>
+#include <system_error>
 
 #if __has_include(<charconv>)
     #include <charconv>
@@ -4061,19 +4063,23 @@ void GCodeProcessor::process_T(const GCodeReader::GCodeLine& line)
 
 void GCodeProcessor::process_T(const std::string_view command)
 {
+    unsigned int new_extruder = 0;
+    auto         ret          = std::from_chars(command.data() + 1, command.data()+command.size(), new_extruder);
+    if (std::errc::invalid_argument == ret.ec)
+        return;
+
     if (command.length() > 1) {
-        int eid = 0;
-        if (! parse_number(command.substr(1), eid) || eid < 0 || eid > 254) {
+        if (new_extruder < 0 || new_extruder > 254) {
             //BBS: T255, T1000 and T1100 is used as special command for BBL machine and does not cost time. return directly
             if ((m_flavor == gcfMarlinLegacy || m_flavor == gcfMarlinFirmware) && (command == "Tx" || command == "Tc" || command == "T?" ||
-                 eid == 1000 || eid == 1100 || eid == 255))
+                 new_extruder == 1000 || new_extruder == 1100 || new_extruder == 255))
                 return;
 
             // T-1 is a valid gcode line for RepRap Firmwares (used to deselects all tools)
-            if ((m_flavor != gcfRepRapFirmware && m_flavor != gcfRepRapSprinter) || eid != -1)
+            if ((m_flavor != gcfRepRapFirmware && m_flavor != gcfRepRapSprinter) || new_extruder != -1)
                 BOOST_LOG_TRIVIAL(error) << "Invalid T command (" << command << ").";
         } else {
-            unsigned char id = static_cast<unsigned char>(eid);
+            unsigned char id = static_cast<unsigned char>(new_extruder);
             if (m_extruder_id != id) {
                 if (id >= m_result.extruders_count)
                     BOOST_LOG_TRIVIAL(error) << "Invalid T command (" << command << ").";