diff --git a/plugins/sip/calls-sip-media-manager.h b/plugins/sip/calls-sip-media-manager.h
index 3dfc93e..0fecace 100644
--- a/plugins/sip/calls-sip-media-manager.h
+++ b/plugins/sip/calls-sip-media-manager.h
@@ -30,6 +30,8 @@
 #include <sofia-sip/sdp.h>
 #include <glib-object.h>
 
+G_BEGIN_DECLS
+
 #define CALLS_TYPE_SIP_MEDIA_MANAGER (calls_sip_media_manager_get_type ())
 
 G_DECLARE_FINAL_TYPE (CallsSipMediaManager, calls_sip_media_manager, CALLS, SIP_MEDIA_MANAGER, GObject)
@@ -49,3 +51,5 @@ MediaCodecInfo*       get_best_codec                                        (Cal
 GList *               calls_sip_media_manager_codec_candidates              (CallsSipMediaManager *self);
 GList *               calls_sip_media_manager_get_codecs_from_sdp           (CallsSipMediaManager *self,
                                                                              sdp_media_t          *sdp_media);
+
+G_END_DECLS