1 files changed, 1 insertions, 1 deletions

diff --git a/mempool/include/mempool.h b/mempool/include/mempool.h
index 245173b..04d0313 100644
--- a/mempool/include/mempool.h
+++ b/mempool/include/mempool.h
@@ -106,8 +106,8 @@
 /// It is valid to mempool_free() the object at each step of the iteration.
 #define mempool_foreach(POOL, ITER, BODY)                                  \
   {                                                                        \
-    size_t i = (POOL)->pool.used;                                          \
     if ((POOL)->pool.num_used_blocks > 0) {                                \
+      size_t i = (POOL)->pool.used;                                        \
       do {                                                                 \
         if ((POOL)->pool.block_info[i].used) {                             \
           __typeof__((POOL)->object[0])* ITER =                            \