diff --git a/Help/manual/cmake-buildsystem.7.rst b/Help/manual/cmake-buildsystem.7.rst
index bceff2d895..76d24c181b 100644
--- a/Help/manual/cmake-buildsystem.7.rst
+++ b/Help/manual/cmake-buildsystem.7.rst
@@ -1047,7 +1047,7 @@ them to a header set using the :command:`target_sources` command:
 
   add_library(Eigen INTERFACE)
 
-  target_sources(Eigen INTERFACE
+  target_sources(Eigen PUBLIC
     FILE_SET HEADERS
       BASE_DIRS src
       FILES src/eigen.h src/vector.h src/matrix.h