diff --git a/bacnet-stack/ports/bdk-atxx4-mstp/iar2gcc.h b/bacnet-stack/ports/bdk-atxx4-mstp/iar2gcc.h
index 756eaac1..0e49077f 100644
--- a/bacnet-stack/ports/bdk-atxx4-mstp/iar2gcc.h
+++ b/bacnet-stack/ports/bdk-atxx4-mstp/iar2gcc.h
@@ -268,9 +268,13 @@ typedef struct {
 #if ((__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ < 3)) || \
      ((__GNUC__ == 4) && (__GNUC_MINOR__ == 3) && (__GNUC_PATCHLEVEL__ <= 3)))
     /* bug in WinAVR - not quite IAR compatible */
+#ifndef __EEPUT
 #define __EEPUT _EEPUT
+#endif
+#ifndef __EEGET
 #define __EEGET _EEGET
 #endif
+#endif
 #elif defined (__CROSSWORKS_AVR)
 /* use functions defined in crt0.s to mimic IAR macros */
 void __uint8_eeprom_store(