diff --git a/src/libslic3r/GCodeReader.cpp b/src/libslic3r/GCodeReader.cpp
index aa04e69f2..0fd09d920 100644
--- a/src/libslic3r/GCodeReader.cpp
+++ b/src/libslic3r/GCodeReader.cpp
@@ -74,7 +74,7 @@ const char* GCodeReader::parse_line_internal(const char *ptr, const char *end, G
             if (axis != NUM_AXES_WITH_UNKNOWN) {
                 // Try to parse the numeric value.
                 double v;
-                auto [pend, ec] = fast_float::from_chars(++ c, end, v);
+                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.
                     if (axis != UNKNOWN_AXIS)