diff --git a/DCCTimerMEGAAVR.cpp b/DCCTimerMEGAAVR.cpp
index 2b2bdab..f7badfd 100644
--- a/DCCTimerMEGAAVR.cpp
+++ b/DCCTimerMEGAAVR.cpp
@@ -125,6 +125,11 @@ void DCCTimer::reset() {
   while(true){}
 }
 
+void DCCTimer::DCCEXanalogWriteFrequency(uint8_t pin, uint32_t f) {
+}
+void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t fbits) {
+}
+
 int16_t ADCee::ADCmax() {
   return 4095;
 }
diff --git a/DCCTimerSAMD.cpp b/DCCTimerSAMD.cpp
index f878ae5..4929ab8 100644
--- a/DCCTimerSAMD.cpp
+++ b/DCCTimerSAMD.cpp
@@ -156,6 +156,11 @@ void DCCTimer::reset() {
     while(true) {};
 }
 
+void DCCTimer::DCCEXanalogWriteFrequency(uint8_t pin, uint32_t f) {
+}
+void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t fbits) {
+}
+
 #define NUM_ADC_INPUTS NUM_ANALOG_INPUTS
 
 uint16_t ADCee::usedpins = 0;
diff --git a/DCCTimerTEENSY.cpp b/DCCTimerTEENSY.cpp
index 0619e21..fd512e9 100644
--- a/DCCTimerTEENSY.cpp
+++ b/DCCTimerTEENSY.cpp
@@ -141,6 +141,11 @@ void DCCTimer::reset() {
   SCB_AIRCR = 0x05FA0004;
 }
 
+void DCCTimer::DCCEXanalogWriteFrequency(uint8_t pin, uint32_t f) {
+}
+void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t fbits) {
+}
+
 int16_t ADCee::ADCmax() {
   return 4095;
 }