diff --git a/sys/sys/buf_ring.h b/sys/sys/buf_ring.h
--- a/sys/sys/buf_ring.h
+++ b/sys/sys/buf_ring.h
@@ -116,7 +116,7 @@
 			}
 			continue;
 		}
-	} while (!atomic_cmpset_acq_32(&br->br_prod_head, prod_head, prod_next));
+	} while (!atomic_cmpset_32(&br->br_prod_head, prod_head, prod_next));
 	prod_idx = prod_head & mask;
 #ifdef DEBUG_BUFRING
 	if (br->br_ring[prod_idx] != NULL)
@@ -163,7 +163,7 @@
 			critical_exit();
 			return (NULL);
 		}
-	} while (!atomic_cmpset_acq_32(&br->br_cons_head, cons_head, cons_next));
+	} while (!atomic_cmpset_32(&br->br_cons_head, cons_head, cons_next));
 	cons_idx = cons_head & mask;
 
 	buf = br->br_ring[cons_idx];