diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go
index 6695372a3f..be3a9bd26f 100644
--- a/src/runtime/malloc.go
+++ b/src/runtime/malloc.go
@@ -1248,7 +1248,7 @@ func persistentalloc1(size, align uintptr, sysStat *uint64) *notInHeap {
 				break
 			}
 		}
-		persistent.off = sys.PtrSize
+		persistent.off = round(sys.PtrSize, align)
 	}
 	p := persistent.base.add(persistent.off)
 	persistent.off += size