diff --git a/src/protocols/RTTY/RTTY.cpp b/src/protocols/RTTY/RTTY.cpp
index 1a96d5e2..7b023f8e 100644
--- a/src/protocols/RTTY/RTTY.cpp
+++ b/src/protocols/RTTY/RTTY.cpp
@@ -1,4 +1,5 @@
 #include "RTTY.h"
+#if !defined(RADIOLIB_EXCLUDE_RTTY)
 
 ITA2String::ITA2String(char c) {
   _len = 1;
@@ -109,10 +110,12 @@ RTTYClient::RTTYClient(PhysicalLayer* phy) {
   _audio = nullptr;
 }
 
+#if !defined(RADIOLIB_EXCLUDE_AFSK)
 RTTYClient::RTTYClient(AFSKClient* audio) {
   _phy = audio->_phy;
   _audio = audio;
 }
+#endif
 
 int16_t RTTYClient::begin(float base, uint32_t shift, uint16_t rate, uint8_t encoding, uint8_t stopBits) {
   // save configuration
@@ -531,3 +534,5 @@ int16_t RTTYClient::standby() {
     return(_phy->standby());
   }
 }
+
+#endif
diff --git a/src/protocols/RTTY/RTTY.h b/src/protocols/RTTY/RTTY.h
index 1e6120c1..7dc54076 100644
--- a/src/protocols/RTTY/RTTY.h
+++ b/src/protocols/RTTY/RTTY.h
@@ -1,4 +1,4 @@
-#ifndef _RADIOLIB_RTTY_H
+#if !defined(_RADIOLIB_RTTY_H) && !defined(RADIOLIB_EXCLUDE_RTTY)
 #define _RADIOLIB_RTTY_H
 
 #include "../../TypeDef.h"
@@ -91,12 +91,14 @@ class RTTYClient {
     */
     RTTYClient(PhysicalLayer* phy);
 
+    #if !defined(RADIOLIB_EXCLUDE_AFSK)
     /*!
       \brief Constructor for AFSK mode.
 
       \param audio Pointer to the AFSK instance providing audio.
     */
     RTTYClient(AFSKClient* audio);
+    #endif
 
     // basic methods
 
@@ -155,7 +157,11 @@ class RTTYClient {
   private:
 #endif
     PhysicalLayer* _phy;
+    #if !defined(RADIOLIB_EXCLUDE_AFSK)
     AFSKClient* _audio;
+    #else
+    void* _audio;
+    #endif
 
     uint8_t _encoding;
     uint32_t _base, _baseHz;