diff --git a/mem-pool.c b/mem-pool.c
index 07fd0994c9f1ad..8dadf5f2990c60 100644
--- a/mem-pool.c
+++ b/mem-pool.c
@@ -4,6 +4,7 @@
 
 #include "git-compat-util.h"
 #include "mem-pool.h"
+#include "trace.h"
 
 static struct trace_key trace_mem_pool = TRACE_KEY_INIT(MEMPOOL);
 #define BLOCK_GROWTH_SIZE (1024 * 1024 - sizeof(struct mp_block))