diff --git a/src/picom.c b/src/picom.c
index ca049748..4de2f658 100644
--- a/src/picom.c
+++ b/src/picom.c
@@ -1895,8 +1895,11 @@ static void draw_callback_impl(EV_P_ session_t *ps, int revents attr_unused) {
 static void draw_callback(EV_P_ ev_timer *w, int revents) {
 	session_t *ps = session_ptr(w, draw_timer);
 
-	draw_callback_impl(EV_A_ ps, revents);
+	// The draw timer has to be stopped before calling the draw_callback_impl
+	// function because it may be set and started there, e.g. when a custom
+	// animated shader is used.
 	ev_timer_stop(EV_A_ w);
+	draw_callback_impl(EV_A_ ps, revents);
 
 	// Immediately start next frame if we are in benchmark mode.
 	if (ps->o.benchmark) {