diff --git a/src/nxt_unit.c b/src/nxt_unit.c
index ab622e56..7c3d945c 100644
--- a/src/nxt_unit.c
+++ b/src/nxt_unit.c
@@ -19,10 +19,6 @@
 #include <linux/memfd.h>
 #endif
 
-#define NXT_UNIT_MAX_PLAIN_SIZE  1024
-#define NXT_UNIT_LOCAL_BUF_SIZE  \
-    (NXT_UNIT_MAX_PLAIN_SIZE + sizeof(nxt_port_msg_t))
-
 #define NXT_UNIT_MAX_PLAIN_SIZE  1024
 #define NXT_UNIT_LOCAL_BUF_SIZE  \
     (NXT_UNIT_MAX_PLAIN_SIZE + sizeof(nxt_port_msg_t))