diff --git a/cmake/glop.cmake b/cmake/glop.cmake
index e24104de5a..0a2551de9d 100644
--- a/cmake/glop.cmake
+++ b/cmake/glop.cmake
@@ -279,6 +279,7 @@ install(FILES
   ortools/base/file.h
   ortools/base/hash.h
   ortools/base/int_type.h
+  ortools/base/strong_int.h
   ortools/base/strong_vector.h
   ortools/base/integral_types.h
   ortools/base/log_severity.h