diff --git a/libsigrok-internal.h b/libsigrok-internal.h
index 453c6583..5fc0fbfa 100644
--- a/libsigrok-internal.h
+++ b/libsigrok-internal.h
@@ -116,7 +116,6 @@ SR_PRIV int sr_source_add(int fd, int events, int timeout,
 
 /*--- session.c -------------------------------------------------------------*/
 
-SR_PRIV int sr_session_iteration(gboolean block);
 SR_PRIV int sr_session_send(const struct sr_dev_inst *sdi,
 		const struct sr_datafeed_packet *packet);
 SR_PRIV int sr_session_stop_sync(void);
diff --git a/session.c b/session.c
index 514b620a..15be92c8 100644
--- a/session.c
+++ b/session.c
@@ -248,7 +248,7 @@ SR_API int sr_session_datafeed_callback_add(sr_datafeed_callback_t cb, void *cb_
  *
  * @return SR_OK upon success, SR_ERR on errors.
  */
-SR_PRIV int sr_session_iteration(gboolean block)
+static int sr_session_iteration(gboolean block)
 {
 	unsigned int i;
 	int ret;