1 files changed, 1 insertions, 1 deletions
diff --git a/Arduino.mk b/Arduino.mk
index 02efc4b..767f493 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -785,7 +785,7 @@ else
 endif
 
 # Using += instead of =, so that CPPFLAGS can be set per sketch level
-CPPFLAGS      += -$(MCU_FLAG_NAME)=$(MCU) -DF_CPU=$(F_CPU) -DARDUINO=$(ARDUINO_VERSION) \
+CPPFLAGS      += -$(MCU_FLAG_NAME)=$(MCU) -DF_CPU=$(F_CPU) -DARDUINO=$(ARDUINO_VERSION) -D__PROG_TYPES_COMPAT__ \
         -I. -I$(ARDUINO_CORE_PATH) -I$(ARDUINO_VAR_PATH)/$(VARIANT) \
         $(SYS_INCLUDES) $(USER_INCLUDES) -Wall -ffunction-sections \
         -fdata-sections