diff --git a/lightningd/pay.c b/lightningd/pay.c
index 6a2669771..c7d1c2dbe 100644
--- a/lightningd/pay.c
+++ b/lightningd/pay.c
@@ -803,7 +803,7 @@ Utility
 -----------------------------------------------------------------------------*/
 
 /* Outputs fields, not a separate object*/
-static void
+void
 json_add_payment_fields(struct json_result *response,
 			const struct wallet_payment *t)
 {
diff --git a/lightningd/pay.h b/lightningd/pay.h
index a98f9d375..152274f67 100644
--- a/lightningd/pay.h
+++ b/lightningd/pay.h
@@ -7,6 +7,7 @@
 #include <wire/gen_onion_wire.h>
 
 struct htlc_out;
+struct json_result;
 struct lightningd;
 struct route_hop;
 struct sha256;
@@ -86,4 +87,10 @@ void payment_failed(struct lightningd *ld, const struct htlc_out *hout,
 /* Inform payment system to save the payment. */
 void payment_store(struct lightningd *ld, const struct sha256 *payment_hash);
 
+/* Output the fields of a payment. Caller should have put the
+ * response within a JSON object and is responsible for
+ * closing the object. */
+void json_add_payment_fields(struct json_result *response,
+			     const struct wallet_payment *t);
+
 #endif /* LIGHTNING_LIGHTNINGD_PAY_H */