diff --git a/lib/read.c b/lib/read.c
index fb2ca491..477eea3f 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -34,7 +34,7 @@ glibtop_read_l (glibtop *server, size_t size, void *buf)
 	glibtop_init_r (&server, 0, 0);
 
 #ifdef LIBGTOP_ENABLE_DEBUG
-	fprintf (stderr, "LIBRARY: really reading %d bytes.\n", (int)size);
+	glibtop_warn_r(server, "LIBRARY: really reading %d bytes.\n", (int)size);
 #endif
 
 	fd = server->socket ? server->socket : server->input[0];