diff --git a/serve.c b/serve.c
index f11c0e07c4..7bf5f23ea6 100644
--- a/serve.c
+++ b/serve.c
@@ -156,8 +156,8 @@ static int is_command(const char *key, struct protocol_capability **command)
 	return 0;
 }
 
-int has_capability(const struct strvec *keys, const char *capability,
-		   const char **value)
+static int has_capability(const struct strvec *keys, const char *capability,
+			  const char **value)
 {
 	int i;
 	for (i = 0; i < keys->nr; i++) {
diff --git a/serve.h b/serve.h
index fc2683e24d..56da77a87a 100644
--- a/serve.h
+++ b/serve.h
@@ -1,10 +1,6 @@
 #ifndef SERVE_H
 #define SERVE_H
 
-struct strvec;
-int has_capability(const struct strvec *keys, const char *capability,
-		   const char **value);
-
 struct serve_options {
 	unsigned advertise_capabilities;
 	unsigned stateless_rpc;