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-rw-r--r--src/common/mempool.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/common/mempool.c b/src/common/mempool.c
index 6a41d220fe..d489cf6550 100644
--- a/src/common/mempool.c
+++ b/src/common/mempool.c
@@ -144,7 +144,7 @@ struct mp_chunk_t {
};
/** Number of extra bytes needed beyond mem_size to allocate a chunk. */
-#define CHUNK_OVERHEAD (sizeof(mp_chunk_t)-1)
+#define CHUNK_OVERHEAD STRUCT_OFFSET(mp_chunk_t, mem[0])
/** Given a pointer to a mp_allocated_t, return a pointer to the memory
* item it holds. */