diff --git a/lib-src/libnyquist/nyquist/nyqsrc/sound.c b/lib-src/libnyquist/nyquist/nyqsrc/sound.c
index 0a9e9f3eb..6078502de 100644
--- a/lib-src/libnyquist/nyquist/nyqsrc/sound.c
+++ b/lib-src/libnyquist/nyquist/nyqsrc/sound.c
@@ -545,6 +545,7 @@ void snd_list_unref(snd_list_type list)
             break; // the rest of the list is shared, nothing more to free
         }
 
+        next = NULL;
         // list nodes either point to a block of samples or this is the 
         // last list node (list->block == NULL) which points to a suspension
         // lists can also terminate at the zero_block, which is an infinite