diff --git a/tests/unicode-encoding.c b/tests/unicode-encoding.c
index 75c982e3e..b1dc885c8 100644
--- a/tests/unicode-encoding.c
+++ b/tests/unicode-encoding.c
@@ -161,7 +161,7 @@ process (gint      line,
       if (!ucs4_equal (ucs4_result, ucs4) ||
 	  items_written != ucs4_len)
 	{
-	  fail ("line %d: results of conversion to ucs4 do not match expected.\n", line);
+	  fail ("line %d: results of fast conversion to ucs4 do not match expected.\n", line);
 	  return;
 	}