diff --git a/test/05-real.txt b/test/05-real.txt
index b0c79b9..07c6065 100644
--- a/test/05-real.txt
+++ b/test/05-real.txt
@@ -62,7 +62,7 @@ pi
 del
 
 # prec error (1)
-1 prec
+0 prec
 -> error should be 4
 del