diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c
index cac34bb085..a8ce7ce9a2 100644
--- a/libavcodec/aacsbr.c
+++ b/libavcodec/aacsbr.c
@@ -1182,14 +1182,15 @@ static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
     int i, n;
     const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
     int scale_and_bias = scale != 1.0f || bias != 0.0f;
+    const int step = 128 >> div;
     float *v;
     for (i = 0; i < 32; i++) {
-        if (*v_off == 0) {
+        if (*v_off < step) {
             int saved_samples = (1280 - 128) >> div;
             memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
-            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
+            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
         } else {
-            *v_off -= 128 >> div;
+            *v_off -= step;
         }
         v = v0 + *v_off;
         if (div) {