diff --git a/libavcodec/lpc.c b/libavcodec/lpc.c
index 3238ad5fc8..4885d5cb06 100644
--- a/libavcodec/lpc.c
+++ b/libavcodec/lpc.c
@@ -38,6 +38,11 @@ static void lpc_apply_welch_window_c(const int32_t *data, int len,
     double w;
     double c;
 
+    if (len == 1) {
+        w_data[0] = 0.0;
+        return;
+    }
+
     n2 = (len >> 1);
     c = 2.0 / (len - 1.0);