diff --git a/lib/ct-dpif.c b/lib/ct-dpif.c
index 542b18c16..a7ffe4a16 100644
--- a/lib/ct-dpif.c
+++ b/lib/ct-dpif.c
@@ -31,7 +31,6 @@ struct flags {
     const char *name;
 };
 
-static void ct_dpif_format_ipproto(struct ds *, uint16_t ipproto);
 static void ct_dpif_format_counters(struct ds *,
                                     const struct ct_dpif_counters *);
 static void ct_dpif_format_timestamp(struct ds *,
@@ -331,7 +330,7 @@ ct_dpif_format_entry(const struct ct_dpif_entry *entry, struct ds *ds,
     }
 }
 
-static void
+void
 ct_dpif_format_ipproto(struct ds *ds, uint16_t ipproto)
 {
     const char *name;
diff --git a/lib/ct-dpif.h b/lib/ct-dpif.h
index 60179334b..2745e6abe 100644
--- a/lib/ct-dpif.h
+++ b/lib/ct-dpif.h
@@ -252,6 +252,7 @@ int ct_dpif_ipf_dump_done(struct dpif *dpif, void *);
 void ct_dpif_entry_uninit(struct ct_dpif_entry *);
 void ct_dpif_format_entry(const struct ct_dpif_entry *, struct ds *,
                           bool verbose, bool print_stats);
+void ct_dpif_format_ipproto(struct ds *ds, uint16_t ipproto);
 void ct_dpif_format_tuple(struct ds *, const struct ct_dpif_tuple *);
 uint8_t ct_dpif_coalesce_tcp_state(uint8_t state);
 void ct_dpif_format_tcp_stat(struct ds *, int, int);