diff --git a/src/stdlib/SDL_malloc.c b/src/stdlib/SDL_malloc.c
index ad2f769ac9..6d174057df 100644
--- a/src/stdlib/SDL_malloc.c
+++ b/src/stdlib/SDL_malloc.c
@@ -4046,6 +4046,7 @@ static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
     else
       break;
   }
+  (void)nfences;
   assert(nfences >= 2);
 
   /* Insert the rest of old top into a bin as an ordinary free chunk */