diff --git a/src/deemon/objects/list.c b/src/deemon/objects/list.c
index bd4d3ae5c..3eee1dbbe 100644
--- a/src/deemon/objects/list.c
+++ b/src/deemon/objects/list.c
@@ -106,7 +106,10 @@ list_assign(List *me, DeeObject *other) {
 	DeeList_LockEndWrite(me);
 
 	/* Free the list state that got created while we loaded `other' */
-	if unlikely(old_elemv) {
+#ifndef __OPTIMIZE_SIZE__
+	if unlikely(old_elemv)
+#endif /* !__OPTIMIZE_SIZE__ */
+	{
 		Dee_Decrefv(old_elemv, old_elemc);
 		Dee_Free(old_elemv);
 	}
diff --git a/src/deemon/objects/seq/fastseq.c b/src/deemon/objects/seq/fastseq.c
index b6d1daa24..bad4491af 100644
--- a/src/deemon/objects/seq/fastseq.c
+++ b/src/deemon/objects/seq/fastseq.c
@@ -436,7 +436,7 @@ DeeSeq_AsHeapVectorWithAllocReuse(DeeObject *__restrict self,
 	DeeObject **new_elemv, **elemv = *p_vector;
 	DREF DeeObject *iterator, *elem;
 #ifdef Dee_MallocUsableSize
-	size_t elema = Dee_MallocUsableSize(elemv);
+	size_t elema = Dee_MallocUsableSize(elemv) / sizeof(DREF DeeObject *);
 #else /* Dee_MallocUsableSize */
 	size_t elema = *p_allocated;
 #endif /* !Dee_MallocUsableSize */
@@ -553,7 +553,7 @@ DeeSeq_AsHeapVectorWithAllocReuseOffset(DeeObject *__restrict self,
 	DeeObject **new_elemv, **elemv = *p_vector;
 	DREF DeeObject *iterator, *elem;
 #ifdef Dee_MallocUsableSize
-	size_t elema = Dee_MallocUsableSize(elemv);
+	size_t elema = Dee_MallocUsableSize(elemv) / sizeof(DREF DeeObject **);
 #else /* Dee_MallocUsableSize */
 	size_t elema = *p_allocated;
 #endif /* !Dee_MallocUsableSize */
@@ -572,7 +572,7 @@ DeeSeq_AsHeapVectorWithAllocReuseOffset(DeeObject *__restrict self,
 			elemv     = new_elemv;
 			*p_vector = new_elemv;
 #ifndef Dee_MallocUsableSize
-			*p_allocated      = offset + elemc;
+			*p_allocated = offset + elemc;
 #endif /* !Dee_MallocUsableSize */
 		}
 		for (i = 0; i < elemc; ++i) {