x.diff

diff --git a/src/6model/serialization.c b/src/6model/serialization.c
index ce3157e..1240376 100644
--- a/src/6model/serialization.c
+++ b/src/6model/serialization.c
@@ -300,7 +300,7 @@ static void get_stable_ref_info(MVMThreadContext *tc, MVMSerializationWriter *wr

 /* Expands current target storage as needed. */
 static void expand_storage_if_needed(MVMThreadContext *tc, MVMSerializationWriter *writer, MVMint64 need) {
-    if (*(writer->cur_write_offset) + need > *(writer->cur_write_limit)) {
+    if (*(writer->cur_write_offset) + need >= *(writer->cur_write_limit)) {
         *(writer->cur_write_limit) *= 2;
         *(writer->cur_write_buffer) = (char *)realloc(*(writer->cur_write_buffer),
             *(writer->cur_write_limit));