diff --git a/src/catalog/tde_global_space.c b/src/catalog/tde_global_space.c
index 8ada5dc3..d1c60b26 100644
--- a/src/catalog/tde_global_space.c
+++ b/src/catalog/tde_global_space.c
@@ -26,6 +26,7 @@
 #include "pg_tde_fe.h"
 #endif
 
+#include <unistd.h>
 #include <openssl/rand.h>
 #include <openssl/err.h>
 #include <sys/time.h>