diff --git a/src/libslic3r/GCode.hpp b/src/libslic3r/GCode.hpp
index 8cf4aa03fb..5208c4a5f3 100644
--- a/src/libslic3r/GCode.hpp
+++ b/src/libslic3r/GCode.hpp
@@ -710,6 +710,7 @@ private:
 
     // Always check gcode placeholders when building in debug mode.
 #if !defined(NDEBUG)
+#undef ORCA_CHECK_GCODE_PLACEHOLDERS
 #define ORCA_CHECK_GCODE_PLACEHOLDERS 1
 #endif