diff --git a/luna/Format.cpp b/luna/Format.cpp
index 6a98be26..02eb0ff6 100644
--- a/luna/Format.cpp
+++ b/luna/Format.cpp
@@ -1,3 +1,4 @@
+#include <CType.h>
 #include <Format.h>
 #include <NumberParsing.h>
 
diff --git a/luna/Format.h b/luna/Format.h
index fd9d95a5..1d06050e 100644
--- a/luna/Format.h
+++ b/luna/Format.h
@@ -1,6 +1,5 @@
 #pragma once
 #include <Attributes.h>
-#include <CType.h>
 #include <Result.h>
 #include <stdarg.h>