diff --git a/gst/audiofx/gstscaletempo.c b/gst/audiofx/gstscaletempo.c
index ad3b949a1e..ed25d13267 100644
--- a/gst/audiofx/gstscaletempo.c
+++ b/gst/audiofx/gstscaletempo.c
@@ -230,7 +230,7 @@ best_overlap_offset_s16 (GstScaletempo * scaletempo)
     ppc = p->buf_pre_corr;
     ppc += p->samples_overlap - p->samples_per_frame;
     ps += p->samples_overlap - p->samples_per_frame;
-    i = -(p->samples_overlap - p->samples_per_frame);
+    i = -((glong) p->samples_overlap - (glong) p->samples_per_frame);
     do {
       corr += ppc[i + 0] * ps[i + 0];
       corr += ppc[i + 1] * ps[i + 1];