diff --git a/net/core/sock.c b/net/core/sock.c
index e23ec80a67bf..fac2b4d80de5 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3497,7 +3497,7 @@ static long sock_prot_memory_allocated(struct proto *proto)
 	return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
 }
 
-static char *sock_prot_memory_pressure(struct proto *proto)
+static const char *sock_prot_memory_pressure(struct proto *proto)
 {
 	return proto->memory_pressure != NULL ?
 	proto_memory_pressure(proto) ? "yes" : "no" : "NI";