diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 9504860944..6baee30403 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -1,9 +1,8 @@
-///|/ Copyright (c) Prusa Research 2020 - 2023 Enrico Turri @enricoturri1966, Vojtěch Bubník @bubnikv, Pavel Mikuš @Godrak, Lukáš Matěna @lukasmatena, Filip Sykala @Jony01, Oleksandra Iushchenko @YuSanka
-///|/ Copyright (c) SuperSlicer 2023 Remi Durand @supermerill
-///|/
-///|/ PrusaSlicer is released under the terms of the AGPLv3 or higher
-///|/
-#include "libslic3r/libslic3r.h"
+///|/ Copyright (c) Prusa Research 2020 - 2023 Enrico Turri @enricoturri1966, Vojtěch Bubník @bubnikv, Pavel Mikuš @Godrak, Lukáš Matěna @lukasmatena, Filip Sykala @Jony01, Oleksandra Iushchenko @YuSanka
+///|/ Copyright (c) SuperSlicer 2023 Remi Durand @supermerill
+///|/
+///|/ PrusaSlicer is released under the terms of the AGPLv3 or higher
+///|/#include "libslic3r/libslic3r.h"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Print.hpp"
 #include "libslic3r/LocalesUtils.hpp"
@@ -2888,7 +2887,17 @@ void GCodeProcessor::process_G1(const std::array<std::optional<double>, 4>& axes
 void GCodeProcessor::process_G2_G3(const GCodeReader::GCodeLine& line, bool clockwise)
 {
     enum class EFitting { None, IJ, R };
-    const EFitting fitting = line.has('R') ? EFitting::R : (line.has('I') && line.has('J')) ? EFitting::IJ : EFitting::None;
+    const char *axis_pos_I = nullptr;
+    const char *axis_pos_J = nullptr;
+    EFitting fitting = EFitting::None;
+    if (line.has('R')) {
+        fitting = EFitting::R;
+    } else {
+        axis_pos_I = line.axis_pos('I');
+        axis_pos_J = line.axis_pos('J');
+        if (axis_pos_I || axis_pos_J)
+            fitting = EFitting::IJ;
+    }
 
     if (fitting == EFitting::None)
         return;
@@ -2921,7 +2930,10 @@ void GCodeProcessor::process_G2_G3(const GCodeReader::GCodeLine& line, bool cloc
         rel_center.y() = c.y() - m_start_position[Y];
     }
     else {
-        if (!line.has_value('I', rel_center.x()) || !line.has_value('J', rel_center.y()))
+        assert(fitting == EFitting::IJ);
+        if (axis_pos_I && ! line.has_value(axis_pos_I, rel_center.x()))
+            return;
+        if (axis_pos_J && ! line.has_value(axis_pos_J, rel_center.y()))
             return;
     }
 
diff --git a/src/libslic3r/GCodeReader.cpp b/src/libslic3r/GCodeReader.cpp
index 8938d3e22b..ed10f0de8c 100644
--- a/src/libslic3r/GCodeReader.cpp
+++ b/src/libslic3r/GCodeReader.cpp
@@ -237,42 +237,54 @@ const char* GCodeReader::axis_pos(const char *raw_str, char axis)
 
 bool GCodeReader::GCodeLine::has(char axis) const
 {
-    const char *c = axis_pos(m_raw.c_str(), axis);
-    return c != nullptr;
+    return this->axis_pos(axis);
+}
+
+const char* GCodeReader::GCodeLine::axis_pos(char axis) const
+{ 
+    return GCodeReader::axis_pos(this->raw().c_str(), axis);
+}
+
+static bool GCodeReader::GCodeLine::has_value(const char *axis_pos, float &value)
+{
+    if (const char *c = axis_pos; c) {
+        // Try to parse the numeric value.
+        double v = 0.;
+        const char *end = m_raw.c_str() + m_raw.size();
+        auto [pend, ec] = fast_float::from_chars(++ c, end, v);
+        if (pend != c && is_end_of_word(*pend)) {
+            // The axis value has been parsed correctly.
+            value = float(v);
+            return true;
+        }
+    }
+    return false;
 }
 
 bool GCodeReader::GCodeLine::has_value(char axis, float &value) const
 {
     assert(is_decimal_separator_point());
-    const char *c = axis_pos(m_raw.c_str(), axis);
-    if (c == nullptr)
-        return false;
-    // Try to parse the numeric value.
-    double v = 0.;
-    const char* end = m_raw.c_str() + m_raw.size();
-    auto [pend, ec] = fast_float::from_chars(++c, end, v);
-    if (pend != c && is_end_of_word(*pend)) {
-        // The axis value has been parsed correctly.
-        value = float(v);
-        return true;
+    return this->has_value(this->axis_pos(axis), value);
+}
+
+static bool GCodeReader::GCodeLine::has_value(const char *axis_pos, int &value)
+{
+    if (const char *c = axis_pos; c) {
+        // Try to parse the numeric value.
+        char   *pend = nullptr;
+        long    v = strtol(++ c, &pend, 10);
+        if (pend != nullptr && is_end_of_word(*pend)) {
+            // The axis value has been parsed correctly.
+            value = int(v);
+            return true;
+        }
     }
     return false;
 }
 
 bool GCodeReader::GCodeLine::has_value(char axis, int &value) const
 {
-    const char *c = axis_pos(m_raw.c_str(), axis);
-    if (c == nullptr)
-        return false;
-    // Try to parse the numeric value.
-    char   *pend = nullptr;
-    long    v = strtol(++ c, &pend, 10);
-    if (pend != nullptr && is_end_of_word(*pend)) {
-        // The axis value has been parsed correctly.
-        value = int(v);
-        return true;
-    }
-    return false;
+    return this->has_value(this->axis_pos(axis), value);
 }
 
 void GCodeReader::GCodeLine::set(const GCodeReader &reader, const Axis axis, const float new_value, const int decimal_digits)
diff --git a/src/libslic3r/GCodeReader.hpp b/src/libslic3r/GCodeReader.hpp
index 1207f03912..0919043f44 100644
--- a/src/libslic3r/GCodeReader.hpp
+++ b/src/libslic3r/GCodeReader.hpp
@@ -30,11 +30,16 @@ public:
         const std::string_view  comment() const
             { size_t pos = m_raw.find(';'); return (pos == std::string::npos) ? std::string_view() : std::string_view(m_raw).substr(pos + 1); }
 
+        // Return position in this->raw() string starting with the "axis" character.
+        const char* axis_pos(char axis) const;
         bool  has(Axis axis) const { return (m_mask & (1 << int(axis))) != 0; }
         float value(Axis axis) const { return m_axis[axis]; }
         bool  has(char axis) const;
         bool  has_value(char axis, float &value) const;
         bool  has_value(char axis, int &value) const;
+        // Parse value of an axis from raw string starting at axis_pos.
+        static bool has_value(const char *axis_pos, float &value);
+        static bool has_value(const char *axis_pos, int &value);
         float new_X(const GCodeReader &reader) const { return this->has(X) ? this->x() : reader.x(); }
         float new_Y(const GCodeReader &reader) const { return this->has(Y) ? this->y() : reader.y(); }
         float new_Z(const GCodeReader &reader) const { return this->has(Z) ? this->z() : reader.z(); }