diff --git a/gst/rtp/gstrtphdrext-colorspace.c b/gst/rtp/gstrtphdrext-colorspace.c
index 05fd8ddb0a..eded3bed60 100644
--- a/gst/rtp/gstrtphdrext-colorspace.c
+++ b/gst/rtp/gstrtphdrext-colorspace.c
@@ -95,7 +95,7 @@ gst_rtp_header_extension_colorspace_get_max_size (GstRTPHeaderExtension * ext,
       GST_RTP_HDREXT_COLORSPACE_SIZE;
 }
 
-static gsize
+static gssize
 gst_rtp_header_extension_colorspace_write (GstRTPHeaderExtension * ext,
     const GstBuffer * input_meta, GstRTPHeaderExtensionFlags write_flags,
     GstBuffer * output, guint8 * data, gsize size)
diff --git a/gst/rtpmanager/gstrtphdrext-rfc6464.c b/gst/rtpmanager/gstrtphdrext-rfc6464.c
index 1dc1f0f432..03f9e54360 100644
--- a/gst/rtpmanager/gstrtphdrext-rfc6464.c
+++ b/gst/rtpmanager/gstrtphdrext-rfc6464.c
@@ -213,7 +213,7 @@ gst_rtp_header_extension_rfc6464_set_caps_from_attributes (GstRTPHeaderExtension
   return TRUE;
 }
 
-static gsize
+static gssize
 gst_rtp_header_extension_rfc6464_write (GstRTPHeaderExtension * ext,
     const GstBuffer * input_meta, GstRTPHeaderExtensionFlags write_flags,
     GstBuffer * output, guint8 * data, gsize size)
diff --git a/gst/rtpmanager/gstrtphdrext-twcc.c b/gst/rtpmanager/gstrtphdrext-twcc.c
index 0ebdea6ec8..c1604aeb0c 100644
--- a/gst/rtpmanager/gstrtphdrext-twcc.c
+++ b/gst/rtpmanager/gstrtphdrext-twcc.c
@@ -57,7 +57,7 @@ static GstRTPHeaderExtensionFlags
 gst_rtp_header_extension_twcc_get_supported_flags (GstRTPHeaderExtension * ext);
 static gsize gst_rtp_header_extension_twcc_get_max_size (GstRTPHeaderExtension *
     ext, const GstBuffer * buffer);
-static gsize gst_rtp_header_extension_twcc_write (GstRTPHeaderExtension * ext,
+static gssize gst_rtp_header_extension_twcc_write (GstRTPHeaderExtension * ext,
     const GstBuffer * input_meta, GstRTPHeaderExtensionFlags write_flags,
     GstBuffer * output, guint8 * data, gsize size);
 static gboolean gst_rtp_header_extension_twcc_read (GstRTPHeaderExtension * ext,
@@ -167,7 +167,7 @@ gst_rtp_header_extension_twcc_get_max_size (GstRTPHeaderExtension * ext,
   return 2;
 }
 
-static gsize
+static gssize
 gst_rtp_header_extension_twcc_write (GstRTPHeaderExtension * ext,
     const GstBuffer * input_meta, GstRTPHeaderExtensionFlags write_flags,
     GstBuffer * output, guint8 * data, gsize size)