diff --git a/firmware/src_simtrace/simtrace.h b/firmware/src_simtrace/simtrace.h
index 2530ec7b..ea2d401f 100644
--- a/firmware/src_simtrace/simtrace.h
+++ b/firmware/src_simtrace/simtrace.h
@@ -8,7 +8,7 @@
 #define DATAIN      2
 #define INT         3
 
-#define BUFLEN  64
+#define BUFLEN  512
 
 #define PHONE_DATAOUT     4
 #define PHONE_DATAIN      5