diff --git a/samplefilt.c b/samplefilt.c
index f320fc9..f350e40 100644
--- a/samplefilt.c
+++ b/samplefilt.c
@@ -267,7 +267,7 @@ select_samples(SPF_Instance filter)
     }
   }
 
-  for (i = j = 0, k = -1; i < filter->used; i++) {
+  for (i = j = 0; i < filter->used; i++) {
     if (selected[i] != -1)
       selected[j++] = (selected[i] + filter->used - o) % filter->used;
   }