1 files changed, 2 insertions, 1 deletions

diff --git a/trace-ftrace.c b/trace-ftrace.c
index af9ac8d..181a00f 100644
--- a/trace-ftrace.c
+++ b/trace-ftrace.c
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/param.h>
 
 #include "trace-cmd.h"
 
@@ -148,7 +149,7 @@ static void print_graph_duration(struct trace_seq *s, unsigned long long duratio
 
         /* Print nsecs (we don't want to exceed 7 numbers) */
         if ((s->len - len) < 7) {
-                snprintf(nsecs_str, 8 - (s->len - len), "%03lu", nsecs_rem);
+                snprintf(nsecs_str, MIN(sizeof(nsecs_str), 8 - len), "%03lu", nsecs_rem);
                 trace_seq_printf(s, ".%s", nsecs_str);
         }