diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index d58b491..fe3c846 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2421,7 +2421,7 @@
 	}
 }
 
-static const char *rtn_type_names[__RTN_MAX] = {
+static const char *const rtn_type_names[__RTN_MAX] = {
 	[RTN_UNSPEC] = "UNSPEC",
 	[RTN_UNICAST] = "UNICAST",
 	[RTN_LOCAL] = "LOCAL",