diff --git a/Source/cmWindowsRegistry.h b/Source/cmWindowsRegistry.h
index bb9090ec04..2eed2977f4 100644
--- a/Source/cmWindowsRegistry.h
+++ b/Source/cmWindowsRegistry.h
@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #pragma once
 
+#include <cstdint> // IWYU pragma: keep
 #include <string>
 #include <vector>