diff --git a/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
index 596dae6e45..e4a8d30607 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/iomcu/hwdef.dat
@@ -95,10 +95,6 @@ define RCIN_ICU_TIMER ICUD1
 define RCIN_ICU_CHANNEL ICU_CHANNEL_1
 define STM32_RCIN_DMA_STREAM STM32_DMA_STREAM_ID(1, 2)
 
-# only use pulse input for PPM, other protocols
-# are on serial
-define HAL_RCIN_PULSE_PPM_ONLY
-
 #DMA Channel Not relevant for F1 series
 define STM32_RCIN_DMA_CHANNEL 0
 
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/iomcu_f103_8MHz/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/iomcu_f103_8MHz/hwdef.dat
index 2d45fa8b91..c28e82e3d3 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/iomcu_f103_8MHz/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/iomcu_f103_8MHz/hwdef.dat
@@ -95,10 +95,6 @@ define RCIN_ICU_TIMER ICUD1
 define RCIN_ICU_CHANNEL ICU_CHANNEL_1
 define STM32_RCIN_DMA_STREAM STM32_DMA_STREAM_ID(1, 2)
 
-# only use pulse input for PPM, other protocols
-# are on serial
-define HAL_RCIN_PULSE_PPM_ONLY
-
 #DMA Channel Not relevant for F1 series
 define STM32_RCIN_DMA_CHANNEL 0