diff --git a/Firmware/tmc2130.cpp b/Firmware/tmc2130.cpp
index 33991c07..5f5fe5aa 100644
--- a/Firmware/tmc2130.cpp
+++ b/Firmware/tmc2130.cpp
@@ -76,8 +76,12 @@ bool tmc2130_sg_change = false;
 bool skip_debug_msg = false;
 
 #define DBG(args...) printf_P(args)
+#ifndef _n
 #define _n PSTR
+#endif //_n
+#ifndef _i
 #define _i PSTR
+#endif //_i
 
 //TMC2130 registers
 #define TMC2130_REG_GCONF      0x00 // 17 bits
diff --git a/Firmware/xyzcal.cpp b/Firmware/xyzcal.cpp
index 9eb58fd9..ed3d3210 100644
--- a/Firmware/xyzcal.cpp
+++ b/Firmware/xyzcal.cpp
@@ -21,7 +21,9 @@
 
 #define DBG(args...) printf_P(args)
 //#define DBG(args...)
+#ifndef _n
 #define _n PSTR
+#endif //_n
 
 #define _X ((int16_t)count_position[X_AXIS])
 #define _Y ((int16_t)count_position[Y_AXIS])