diff --git a/libraries/AP_HAL_ChibiOS/SoftSigReader.h b/libraries/AP_HAL_ChibiOS/SoftSigReader.h
index 61af139f74..13c1147165 100644
--- a/libraries/AP_HAL_ChibiOS/SoftSigReader.h
+++ b/libraries/AP_HAL_ChibiOS/SoftSigReader.h
@@ -23,7 +23,7 @@
 #if HAL_USE_ICU == TRUE
 
 #define INPUT_CAPTURE_FREQUENCY 1000000 //capture unit in microseconds
-#define MAX_SIGNAL_TRANSITIONS 256
+#define MAX_SIGNAL_TRANSITIONS 512
 #define DEFAULT_BOUNCE_BUF_SIZE 32
 
 class ChibiOS::SoftSigReader {