diff --git a/Source/cmMachO.h b/Source/cmMachO.h
index faa024b9b0..ec7d54c44d 100644
--- a/Source/cmMachO.h
+++ b/Source/cmMachO.h
@@ -5,6 +5,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include <iosfwd>
+#include <memory>
 #include <string>
 
 #if !defined(CMake_USE_MACH_PARSER)