1 files changed, 1 insertions, 1 deletions
diff --git a/node.h b/node.h
index c6004b8608..cffb174aa5 100644
--- a/node.h
+++ b/node.h
@@ -540,7 +540,7 @@ void *rb_parser_malloc(struct parser_params *, size_t);
 void *rb_parser_realloc(struct parser_params *, void *, size_t);
 void *rb_parser_calloc(struct parser_params *, size_t, size_t);
 void rb_parser_free(struct parser_params *, void *);
-void rb_parser_printf(struct parser_params *parser, const char *fmt, ...);
+PRINTF_ARGS(void rb_parser_printf(struct parser_params *parser, const char *fmt, ...), 2, 3);
 
 RUBY_SYMBOL_EXPORT_END