diff --git a/remote-curl.c b/remote-curl.c
index 28b2a316d3d..b76dcb2e887 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -317,7 +317,7 @@ static size_t rpc_out(void *ptr, size_t eltsize,
 }
 
 #ifndef NO_CURL_IOCTL
-curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
+static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 {
 	struct rpc_state *rpc = clientp;