diff --git a/ChangeLog b/ChangeLog
index c45fa3a5..598a2e47 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2002-05-13  Akim Demaille  <akim@epita.fr>
+
+	* tests/regression.at (Token definitions): Prototype yylex and
+	yyerror.
+
 2002-05-12  Paul Hilfinger  <Hilfinger@CS.Berkeley.EDU>
 
 	* src/scan-skel.l: Correct off-by-one error in handling of __oline__.
diff --git a/tests/regression.at b/tests/regression.at
index 9ebff2e8..f28e9ae3 100644
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -296,7 +296,11 @@ AT_SETUP([Token definitions])
 
 # Bison managed, when fed with `%token 'f' "f"' to #define 'f'!
 AT_DATA([input.y],
-[[%token "end of file"
+[%{
+void yyerror (const char *s);
+int yylex (void);
+%}
+[%token "end of file"
 %token 'a' "a"
 %token "b" 'b'
 %token "c" c