diff --git a/src/lpytab.c b/src/lpytab.c
index 681197f..06c87a5 100644
--- a/src/lpytab.c
+++ b/src/lpytab.c
@@ -214,7 +214,7 @@ int yychar;    /* current input token number */
 /*
 ** yyparse - return 0 if worked, 1 if syntax error not recovered from
 */
-int yyparse() {
+int yyparse(void) {
   YYSTYPE *yypvt; /* top of value stack for $vars */
 
   /*