1 files changed, 2 insertions, 0 deletions
diff --git a/include/lib/monad.h b/include/lib/monad.h
index 4a68e0a..74db079 100644
--- a/include/lib/monad.h
+++ b/include/lib/monad.h
@@ -1,6 +1,8 @@
 #ifndef INC_LIB_MONAD_H
 #define INC_LIB_MONAD_H
 
+#include <lib/bool.h>
+
 struct Result {
   void* data;
   bool_t success;