diff --git a/src/linux/timer.c b/src/linux/timer.c
index dfb0b4c..1de25dc 100644
--- a/src/linux/timer.c
+++ b/src/linux/timer.c
@@ -210,10 +210,16 @@ int
 evfilt_timer_knote_modify(struct filter *filt, struct knote *kn, 
         const struct kevent64_s *kev)
 {
-    (void)filt;
-    (void)kn;
-    (void)kev;
-    return (0); /* STUB */
+    struct itimerspec ts;
+    int tfd = kn->data.pfd;
+
+    convert_to_itimerspec(&ts, kn->kev.data, kn->kev.flags & EV_ONESHOT, kn->kev.fflags);
+    if (timerfd_settime(tfd, 0, &ts, NULL) < 0) {
+        dbg_printf("timerfd_settime(2): %s", strerror(errno));
+        return (-1);
+    }
+
+    return (0);
 }
 
 int
@@ -240,13 +246,23 @@ evfilt_timer_knote_delete(struct filter *filt, struct knote *kn)
 int
 evfilt_timer_knote_enable(struct filter *filt, struct knote *kn)
 {
-    return evfilt_timer_knote_create(filt, kn);
+    return evfilt_timer_knote_modify(filt, kn, &kn->kev);
 }
 
 int
 evfilt_timer_knote_disable(struct filter *filt, struct knote *kn)
 {
-    return evfilt_timer_knote_delete(filt, kn);
+    struct itimerspec ts;
+    int tfd = kn->data.pfd;
+
+    memset(&ts, 0, sizeof(ts));
+
+    if (timerfd_settime(tfd, 0, &ts, NULL) < 0) {
+        dbg_printf("timerfd_settime(2): %s", strerror(errno));
+        return (-1);
+    }
+
+    return 0;
 }
 
 const struct filter evfilt_timer = {