diff --git a/lang/number.c b/lang/number.c
index bd229e7..e0210a9 100644
--- a/lang/number.c
+++ b/lang/number.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: MIT
 // Copyright (c) 2023 John Watts and the LuminaSensum contributors
 
+#include "number.h"
 #include "error.h"
 #include "object.h"
 #include "vm.h"
diff --git a/lang/number.h b/lang/number.h
index 610fe4c..2795191 100644
--- a/lang/number.h
+++ b/lang/number.h
@@ -10,6 +10,6 @@
 Object number_create(int value);
 
 // Gets a number's value
-int number_value(Object);
+int number_value(Object obj);
 
 #endif