diff --git a/libraries/AP_Frsky_Telem/AP_Frsky_Backend.cpp b/libraries/AP_Frsky_Telem/AP_Frsky_Backend.cpp
index d3a41f8374..5ee0b5708b 100644
--- a/libraries/AP_Frsky_Telem/AP_Frsky_Backend.cpp
+++ b/libraries/AP_Frsky_Telem/AP_Frsky_Backend.cpp
@@ -148,6 +148,7 @@ void AP_Frsky_Backend::calc_gps_position(void)
  */
 bool AP_Frsky_Backend::calc_rpm(const uint8_t instance, int32_t &value) const
 {
+#if AP_RPM_ENABLED
     const AP_RPM* rpm = AP::rpm();
     if (rpm == nullptr) {
         return false;
@@ -159,4 +160,7 @@ bool AP_Frsky_Backend::calc_rpm(const uint8_t instance, int32_t &value) const
     }
     value = static_cast<int32_t>(roundf(rpm_value));
     return true;
+#else
+    return false;
+#endif
 }
diff --git a/libraries/AP_Frsky_Telem/AP_Frsky_SPort.cpp b/libraries/AP_Frsky_Telem/AP_Frsky_SPort.cpp
index a16b5c08e5..ee36a8cf51 100644
--- a/libraries/AP_Frsky_Telem/AP_Frsky_SPort.cpp
+++ b/libraries/AP_Frsky_Telem/AP_Frsky_SPort.cpp
@@ -113,6 +113,7 @@ void AP_Frsky_SPort::send(void)
                 }
                 break;
             case SENSOR_ID_RPM: // Sensor ID 4
+#if AP_RPM_ENABLED
                 {
                     const AP_RPM* rpm = AP::rpm();
                     if (rpm == nullptr) {
@@ -132,6 +133,7 @@ void AP_Frsky_SPort::send(void)
                         _SPort.rpm_call = 0;
                     }
                 }
+#endif  // AP_RPM_ENABLED
                 break;
             case SENSOR_ID_SP2UR: // Sensor ID  6
                 switch (_SPort.various_call) {
diff --git a/libraries/AP_Frsky_Telem/AP_Frsky_SPort_Passthrough.cpp b/libraries/AP_Frsky_Telem/AP_Frsky_SPort_Passthrough.cpp
index 59ba140683..f7f645333a 100644
--- a/libraries/AP_Frsky_Telem/AP_Frsky_SPort_Passthrough.cpp
+++ b/libraries/AP_Frsky_Telem/AP_Frsky_SPort_Passthrough.cpp
@@ -222,11 +222,13 @@ bool AP_Frsky_SPort_Passthrough::is_packet_ready(uint8_t idx, bool queue_empty)
     case RPM:
         {
             packet_ready = false;
+#if AP_RPM_ENABLED
             const AP_RPM *rpm = AP::rpm();
             if (rpm == nullptr) {
                 break;
             }
             packet_ready = rpm->num_sensors() > 0;
+#endif
         }
         break;
     case TERRAIN:
@@ -697,6 +699,7 @@ uint32_t AP_Frsky_SPort_Passthrough::calc_attiandrng(void)
  */
 uint32_t AP_Frsky_SPort_Passthrough::calc_rpm(void)
 {
+#if AP_RPM_ENABLED
     const AP_RPM *ap_rpm = AP::rpm();
     if (ap_rpm == nullptr) {
         return 0;
@@ -713,6 +716,9 @@ uint32_t AP_Frsky_SPort_Passthrough::calc_rpm(void)
         value |= (int16_t)roundf(rpm * 0.1) << 16;
     }
     return value;
+#else
+    return 0;
+#endif
 }
 
 /*