diff --git a/ext/srt/gstsrt.c b/ext/srt/gstsrt.c
index 53c8f51e23..e845b14981 100644
--- a/ext/srt/gstsrt.c
+++ b/ext/srt/gstsrt.c
@@ -36,7 +36,7 @@ SRTSOCKET
 gst_srt_client_connect (GstElement * elem, int sender,
     const gchar * host, guint16 port, int rendez_vous,
     const gchar * bind_address, guint16 bind_port, int latency,
-    GSocketAddress ** socket_address, gint * poll_id, gchar * passphrase,
+    GSocketAddress ** socket_address, gint * poll_id, const gchar * passphrase,
     int key_length)
 {
   SRTSOCKET sock = SRT_INVALID_SOCK;
diff --git a/ext/srt/gstsrt.h b/ext/srt/gstsrt.h
index 2b0381e175..776593ed67 100644
--- a/ext/srt/gstsrt.h
+++ b/ext/srt/gstsrt.h
@@ -41,7 +41,7 @@ gst_srt_client_connect (GstElement * elem, int sender,
     const gchar * host, guint16 port, int rendez_vous,
     const gchar * bind_address, guint16 bind_port, int latency,
     GSocketAddress ** socket_address, gint * poll_id,
-    gchar * passphrase, int key_length);
+    const gchar * passphrase, int key_length);
 
 SRTSOCKET
 gst_srt_server_listen (GstElement * elem, int sender,