diff --git a/bison.simple b/bison.simple
index 49c8b857..c0c278a3 100644
--- a/bison.simple
+++ b/bison.simple
@@ -189,7 +189,7 @@ yyparse()
   register short *yyssp;
   register YYSTYPE *yyvsp;
   int yyerrstatus;	/*  number of tokens to shift before error messages enabled */
-  int yychar1;		/*  lookahead token as an internal (translated) token number */
+  int yychar1 = 0;		/*  lookahead token as an internal (translated) token number */
 
   short	yyssa[YYINITDEPTH];	/*  the state stack			*/
   YYSTYPE yyvsa[YYINITDEPTH];	/*  the semantic value stack		*/
diff --git a/src/bison.s1 b/src/bison.s1
index 49c8b857..c0c278a3 100644
--- a/src/bison.s1
+++ b/src/bison.s1
@@ -189,7 +189,7 @@ yyparse()
   register short *yyssp;
   register YYSTYPE *yyvsp;
   int yyerrstatus;	/*  number of tokens to shift before error messages enabled */
-  int yychar1;		/*  lookahead token as an internal (translated) token number */
+  int yychar1 = 0;		/*  lookahead token as an internal (translated) token number */
 
   short	yyssa[YYINITDEPTH];	/*  the state stack			*/
   YYSTYPE yyvsa[YYINITDEPTH];	/*  the semantic value stack		*/
diff --git a/src/bison.simple b/src/bison.simple
index 49c8b857..c0c278a3 100644
--- a/src/bison.simple
+++ b/src/bison.simple
@@ -189,7 +189,7 @@ yyparse()
   register short *yyssp;
   register YYSTYPE *yyvsp;
   int yyerrstatus;	/*  number of tokens to shift before error messages enabled */
-  int yychar1;		/*  lookahead token as an internal (translated) token number */
+  int yychar1 = 0;		/*  lookahead token as an internal (translated) token number */
 
   short	yyssa[YYINITDEPTH];	/*  the state stack			*/
   YYSTYPE yyvsa[YYINITDEPTH];	/*  the semantic value stack		*/