diff --git a/src/backend/port/sysv_shmem.c b/src/backend/port/sysv_shmem.c
index 35cce89e9c9..b649a9fecdf 100644
--- a/src/backend/port/sysv_shmem.c
+++ b/src/backend/port/sysv_shmem.c
@@ -155,6 +155,12 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size)
 		}
 	}
 #endif
+	/*
+	 * NEON: do not create shared memory segments for single user wal redo postgres.
+	 * Many spawned instances of wal redo may exhaust kernel.shmmni
+	 */
+	if (am_wal_redo_postgres)
+		return valloc(size);
 
 	shmid = shmget(memKey, size, IPC_CREAT | IPC_EXCL | IPCProtection);