1 files changed, 1 insertions, 1 deletions
diff --git a/t/yacc-basic.sh b/t/yacc-basic.sh
index cfbaa1957..d50157099 100644
--- a/t/yacc-basic.sh
+++ b/t/yacc-basic.sh
@@ -42,7 +42,7 @@ cat > parse.y << 'END'
 #include <stdio.h>
 #include <stdlib.h>
 int yylex () { return getchar (); }
-void yyerror (char *s) {}
+void yyerror (const char *s) {}
 %}
 %%
 a : 'a' { exit(0); };