diff --git a/megaavr/cores/megatinycore/Arduino.h b/megaavr/cores/megatinycore/Arduino.h
index b2b6492e..3421c0c2 100644
--- a/megaavr/cores/megatinycore/Arduino.h
+++ b/megaavr/cores/megatinycore/Arduino.h
@@ -96,6 +96,10 @@
 
 #if MEGATINYCORE_SERIES < 2
   /* ADC constants for 0/1-series */
+  #define _ADC_ENABLE_VAL   0x10
+  #define _ADC_ENABLE_CTRL  0x20
+  #define _ADC_STANDBY_VAL  0X40
+  #define _ADC_STANDBY_CTRL 0x80
   #define LOW_LAT_ON      badArg("This option is on 2-series tiny and AVR Ex-series only")
   #define LOW_LAT_OFF     badArg("This option is on 2-series tiny and AVR Ex-series only")
   #define ADC_LOWLAT_ON   badArg("This option is on 2-series tiny and AVR Ex-series only")
@@ -103,10 +107,10 @@
   #define PGA_KEEP_ON     badArg("This option is on 2-series tiny and AVR Ex-series only")
   #define PGA_AUTO_OFF    badArg("This option is on 2-series tiny and AVR Ex-series only")
   #define PGA_OFF_ONCE    badArg("This option is on 2-series tiny and AVR Ex-series only")
-  #define ADC_ENABLE      0x20
-  #define ADC_DISABLE     0x30
-  #define ADC_STANDBY_ON  0xC0
-  #define ADC_STANDBY_OFF 0x80
+  #define ADC_ENABLE        _ADC_ENABLE_CTRL  | _ADC_ENABLE_VAL
+  #define ADC_DISABLE       _ADC_ENABLE_CTRL
+  #define ADC_STANDBY_ON    _ADC_STANDBY_CTRL | _ADC_STANDBY_VAL
+  #define ADC_STANDBY_OFF   _ADC_STANDBY_CTRL
   #define INTERNAL0V55    (VREF_ADC0REFSEL_0V55_gc >> VREF_ADC0REFSEL_gp)
   #define INTERNAL1V1     (VREF_ADC0REFSEL_1V1_gc >> VREF_ADC0REFSEL_gp)
   #define INTERNAL2V5     (VREF_ADC0REFSEL_2V5_gc >> VREF_ADC0REFSEL_gp)