diff --git a/src/backend/backend.c b/src/backend/backend.c
index bacf29d..36f80cc 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -189,6 +189,7 @@ void paint_all_new(session_t *ps, struct managed_win *t) {
 			ps->last_schedule_delay = now_us - ps->next_render;
 		}
 	}
+	ps->did_render = true;
 
 	if (ps->backend_data->ops->prepare) {
 		ps->backend_data->ops->prepare(ps->backend_data, &reg_paint);
diff --git a/src/common.h b/src/common.h
index 65d0e7b..e183a1e 100644
--- a/src/common.h
+++ b/src/common.h
@@ -255,6 +255,9 @@ typedef struct session {
 	uint64_t last_schedule_delay;
 	/// When do we want our next frame to start rendering.
 	uint64_t next_render;
+	/// Did we actually render the last frame. Sometimes redraw will be scheduled only
+	/// to find out nothing has changed. In which case this will be set to false.
+	bool did_render;
 	/// Whether we can perform frame pacing.
 	bool frame_pacing;
 
diff --git a/src/picom.c b/src/picom.c
index 8bb22d7..36c8a34 100644
--- a/src/picom.c
+++ b/src/picom.c
@@ -240,12 +240,15 @@ void schedule_render(session_t *ps, bool triggered_by_vblank) {
 	    (int)(render_time.tv_sec * 1000000L + render_time.tv_nsec / 1000L);
 	if (ps->target_msc == ps->last_msc) {
 		// The frame has just been displayed, record its render time;
-		log_trace("Last render call took: %d (gpu) + %d (cpu) us, "
-		          "last_msc: %" PRIu64,
-		          render_time_us, (int)ps->last_schedule_delay, ps->last_msc);
-		render_statistics_add_render_time_sample(
-		    &ps->render_stats, render_time_us + (int)ps->last_schedule_delay);
+		if (ps->did_render) {
+			log_trace("Last render call took: %d (gpu) + %d (cpu) us, "
+			          "last_msc: %" PRIu64,
+			          render_time_us, (int)ps->last_schedule_delay, ps->last_msc);
+			render_statistics_add_render_time_sample(
+			    &ps->render_stats, render_time_us + (int)ps->last_schedule_delay);
+		}
 		ps->target_msc = 0;
+		ps->did_render = false;
 		ps->last_schedule_delay = 0;
 	}