diff --git a/include/utils/hash.h b/include/utils/hash.h
index c14a916..6644e44 100644
--- a/include/utils/hash.h
+++ b/include/utils/hash.h
@@ -1,6 +1,8 @@
 #ifndef CWS_HASH_H
 #define CWS_HASH_H
 
+#include <stdbool.h>
+
 unsigned int my_str_hash_fn(const void *key);
 
 bool my_str_equal_fn(const void *a, const void *b);