1 files changed, 1 insertions, 1 deletions

diff --git a/trace-cmd.c b/trace-cmd.c
index 4466f93..05c0746 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -748,7 +748,7 @@ static void update_filter(const char *event_name, const char *field,
         close(fd);
 
         /* append unless there is currently no filter */
-        if (strcmp(buf, "none") == 0) {
+        if (strncmp(buf, "none", 4) == 0) {
                 filter = malloc_or_die(strlen(pid) + strlen(field) +
                                        strlen("(==)") + 1);
                 sprintf(filter, "(%s==%s)", field, pid);