1 files changed, 1 insertions, 1 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 63b6f8c8edf2..df99ebe852ae 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -124,7 +124,7 @@ struct event_format *event_format__new(const char *sys, const char *name)
                         bf = nbf;
                 }
 
-                n = read(fd, bf + size, BUFSIZ);
+                n = read(fd, bf + size, alloc_size - size);
                 if (n < 0)
                         goto out_free_bf;
                 size += n;