diff --git a/parse_productions.h b/parse_productions.h
index 18894ca78..e6c003ab2 100644
--- a/parse_productions.h
+++ b/parse_productions.h
@@ -7,6 +7,7 @@
 #define FISH_PARSE_TREE_CONSTRUCTION_H
 
 #include "parse_tree.h"
+#include <inttypes.h>
 
 namespace parse_productions
 {
diff --git a/parse_tree.h b/parse_tree.h
index 79cae8ccb..8621cea8f 100644
--- a/parse_tree.h
+++ b/parse_tree.h
@@ -13,6 +13,7 @@
 #include "common.h"
 #include "tokenizer.h"
 #include <vector>
+#include <inttypes.h>
 
 #define PARSE_ASSERT(a) assert(a)
 #define PARSER_DIE() do { fprintf(stderr, "Parser dying!\n"); exit_without_destructors(-1); } while (0)