diff --git a/Kernel/KResult.h b/Kernel/KResult.h
index 2e2143fe0dd..05cc34b61b4 100644
--- a/Kernel/KResult.h
+++ b/Kernel/KResult.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/Assertions.h>
+#include <AK/Format.h>
 #include <AK/Platform.h>
 #include <AK/StdLibExtras.h>
 #include <LibC/errno_numbers.h>