diff --git a/tests/test_perf.c b/tests/test_perf.c
index 7c93278..e456c5d 100644
--- a/tests/test_perf.c
+++ b/tests/test_perf.c
@@ -36,6 +36,7 @@
 #include "dto_test_utils.h"
 
 #include <stdint.h>
+#include <unistd.h>
 #include <sched.h>
 #include <dlfcn.h>
 #include <sys/mman.h>