diff --git a/firmware/src_simtrace/ringbuffer.h b/firmware/src_simtrace/ringbuffer.h
index 662ae095..801e96b5 100644
--- a/firmware/src_simtrace/ringbuffer.h
+++ b/firmware/src_simtrace/ringbuffer.h
@@ -5,7 +5,7 @@
 #include <stdbool.h>
 #include <sys/types.h>
 
-#define RING_BUFLEN 1024
+#define RING_BUFLEN 128
 
 typedef struct ringbuf {
 	uint8_t buf[RING_BUFLEN];