diff --git a/src/ncp/ncp_spi.cpp b/src/ncp/ncp_spi.cpp
index f791bfa6c..218deb000 100644
--- a/src/ncp/ncp_spi.cpp
+++ b/src/ncp/ncp_spi.cpp
@@ -32,6 +32,7 @@
 
 #include <common/code_utils.hpp>
 #include <common/new.hpp>
+#include <net/ip6.hpp>
 #include <ncp/ncp.h>
 #include <ncp/ncp_spi.hpp>
 #include <platform/spi-slave.h>