diff --git a/src/Makefile b/src/Makefile
index f4145fac5..b568ff966 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -168,7 +168,7 @@ CPPDEFS = -DF_CPU=$(F_CPU)UL
 ifeq ($(PCB), STD)
 # STD PCB, so ...
 
-  CPPDEFS += -DPCBSTD
+  CPPDEFS += -DPCBSTD -DEEPROM_ASYNC_WRITE
 # If Hardware PPM mode ( PB0<->BP7) switch the Backlight output with the original PPM to use hardware facility to generate precise PPM (hardware mods)
 # G: TODO This prevents HARDPPM being used with FRSKY. HARDPPM needs its own option XXX
   ifeq ($(EXT), HARDPPM)
diff --git a/src/gruvin9x.h b/src/gruvin9x.h
index d184274f2..1f036948e 100644
--- a/src/gruvin9x.h
+++ b/src/gruvin9x.h
@@ -25,8 +25,6 @@
 #define VERS 1
 #define SUB_VERS 2
 
-#define EEPROM_ASYNC_WRITE
-
 #include <inttypes.h>
 #include <string.h>