diff --git a/include/evaluator.h b/include/evaluator.h
index 78c5730..d176bd2 100644
--- a/include/evaluator.h
+++ b/include/evaluator.h
@@ -2,6 +2,7 @@
 #define EVALUATOR_H
 
 #include "lexer.h"
+#include "arena.h"
 #include <stdint.h>
 
 int64_t evaluate(ASTNode *tree);
diff --git a/include/parser.h b/include/parser.h
index 911d964..03d5443 100644
--- a/include/parser.h
+++ b/include/parser.h
@@ -2,6 +2,7 @@
 #define PARSER_H
 
 #include "lexer.h"
+#include "arena.h"
 #include <stdint.h>
 
 typedef struct {
diff --git a/src/parser.c b/src/parser.c
index c2ac315..6803508 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -1,9 +1,10 @@
 #include "parser.h"
 #include "lexer.h"
+#include "arena.h"
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdlib.h>
-#include <stdio.h>
+
 
 uint8_t node_lbp(ASTNode node) {
     if (node.type == NODE_INTEGER) {