diff --git a/src/shctx.c b/src/shctx.c
index a22730a..c561632 100644
--- a/src/shctx.c
+++ b/src/shctx.c
@@ -624,7 +624,7 @@
 	cur = &shctx->free;
 	for (i = 0 ; i < size ; i++) {
 		prev = cur;
-		cur = (struct shared_block *)((char *)prev + sizeof(struct shared_block));
+		cur++;
 		prev->n = cur;
 		cur->p = prev;
 	}