diff --git a/flight/Libraries/fifo_buffer.c b/flight/Libraries/fifo_buffer.c
index d0fb42081..bd611470a 100644
--- a/flight/Libraries/fifo_buffer.c
+++ b/flight/Libraries/fifo_buffer.c
@@ -30,6 +30,11 @@
 // *****************************************************************************
 // circular buffer functions
 
+uint16_t fifoBuf_size(t_fifo_buffer *buf)
+{	// return the size of the buffer
+	return buf->buf_size;
+}
+
 uint16_t fifoBuf_getUsed(t_fifo_buffer *buf)
 {	// return the number of bytes available in the rx buffer
 
diff --git a/flight/Libraries/inc/fifo_buffer.h b/flight/Libraries/inc/fifo_buffer.h
index e03b24c11..077eb4b4c 100644
--- a/flight/Libraries/inc/fifo_buffer.h
+++ b/flight/Libraries/inc/fifo_buffer.h
@@ -43,6 +43,8 @@ typedef struct
 
 // *********************
 
+uint16_t fifoBuf_size(t_fifo_buffer *buf);
+
 uint16_t fifoBuf_getUsed(t_fifo_buffer *buf);
 uint16_t fifoBuf_getFree(t_fifo_buffer *buf);