diff --git a/ext/opus/gstopusdec.c b/ext/opus/gstopusdec.c
index ebef6e44e6..5b4a156865 100644
--- a/ext/opus/gstopusdec.c
+++ b/ext/opus/gstopusdec.c
@@ -390,7 +390,7 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buffer)
   }
 
   if (buffer) {
-    GST_DEBUG_OBJECT (dec, "Received buffer of size %u",
+    GST_DEBUG_OBJECT (dec, "Received buffer of size %" G_GSIZE_FORMAT,
         gst_buffer_get_size (buffer));
   } else {
     GST_DEBUG_OBJECT (dec, "Received missing buffer");
@@ -414,7 +414,7 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buffer)
     gst_buffer_map (buf, &map, GST_MAP_READ);
     data = map.data;
     size = map.size;
-    GST_DEBUG_OBJECT (dec, "Using buffer of size %u", size);
+    GST_DEBUG_OBJECT (dec, "Using buffer of size %" G_GSIZE_FORMAT, size);
   } else {
     /* concealment data, pass NULL as the bits parameters */
     GST_DEBUG_OBJECT (dec, "Using NULL buffer");
diff --git a/ext/opus/gstopusenc.c b/ext/opus/gstopusenc.c
index 142701b35d..d6dfa9d173 100644
--- a/ext/opus/gstopusenc.c
+++ b/ext/opus/gstopusenc.c
@@ -898,7 +898,7 @@ gst_opus_enc_handle_frame (GstAudioEncoder * benc, GstBuffer * buf)
     enc->header_sent = TRUE;
   }
 
-  GST_DEBUG_OBJECT (enc, "received buffer %p of %u bytes", buf,
+  GST_DEBUG_OBJECT (enc, "received buffer %p of %" G_GSIZE_FORMAT " bytes", buf,
       buf ? gst_buffer_get_size (buf) : 0);
 
   ret = gst_opus_enc_encode (enc, buf);