diff --git a/cobc/ppparse.y b/cobc/ppparse.y
index 699ff302a..fbac2ea84 100644
--- a/cobc/ppparse.y
+++ b/cobc/ppparse.y
@@ -21,8 +21,10 @@
 
 %expect 0
 
-%define parse.error verbose
-%define api.prefix {pp}
+%defines
+%verbose
+%error-verbose
+%name-prefix="pp"
 
 /* NOTE:
    support without = was added in Bison 2.4 (released 2008-11-02, we currently use 2.3),