diff --git a/win32/common/libgstrtp.def b/win32/common/libgstrtp.def
index ef9ee03259..52f654f3cd 100644
--- a/win32/common/libgstrtp.def
+++ b/win32/common/libgstrtp.def
@@ -107,6 +107,7 @@ EXPORTS
 	gst_rtp_buffer_get_timestamp
 	gst_rtp_buffer_get_version
 	gst_rtp_buffer_map
+	gst_rtp_buffer_map_flags_get_type
 	gst_rtp_buffer_new_allocate
 	gst_rtp_buffer_new_allocate_len
 	gst_rtp_buffer_new_copy_data