diff --git a/libraries/AP_HAL_AVR/RCInput_APM1.cpp b/libraries/AP_HAL_AVR/RCInput_APM1.cpp
index 50d4f50a4b..4f2998c1ff 100644
--- a/libraries/AP_HAL_AVR/RCInput_APM1.cpp
+++ b/libraries/AP_HAL_AVR/RCInput_APM1.cpp
@@ -84,7 +84,7 @@ static inline uint16_t constrain_pulse(uint16_t p) {
 
 uint16_t APM1RCInput::read(uint8_t ch) {
     /* constrain ch */
-    if (ch < AVR_RC_INPUT_NUM_CHANNELS) return 0;
+    if (ch >= AVR_RC_INPUT_NUM_CHANNELS) return 0;
     /* grab channel from isr's memory in critical section*/
     cli();
     uint16_t capt = _pulse_capt[ch];
diff --git a/libraries/AP_HAL_AVR/RCInput_APM2.cpp b/libraries/AP_HAL_AVR/RCInput_APM2.cpp
index 478a550b14..0e4d883f8c 100644
--- a/libraries/AP_HAL_AVR/RCInput_APM2.cpp
+++ b/libraries/AP_HAL_AVR/RCInput_APM2.cpp
@@ -84,7 +84,7 @@ static inline uint16_t constrain_pulse(uint16_t p) {
 
 uint16_t APM2RCInput::read(uint8_t ch) {
     /* constrain ch */
-    if (ch < AVR_RC_INPUT_NUM_CHANNELS) return 0;
+    if (ch >= AVR_RC_INPUT_NUM_CHANNELS) return 0;
     /* grab channel from isr's memory in critical section*/
     cli();
     uint16_t capt = _pulse_capt[ch];