diff --git a/CMakeLists.txt b/CMakeLists.txt
index 99d73d4..e08f11a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,7 +37,7 @@ target_compile_definitions(launchpad PRIVATE BUILDING_LAUNCHPAD)
 set_target_properties(launchpad PROPERTIES
     VERSION ${PROJECT_VERSION}
     SOVERSION 0
-    PUBLIC_HEADER "src/launchpad.h;src/callablewrapper.h;src/archive.h;src/archive_permission.h;src/utils.h;src/person.h;src/distribution.h;src/authentication.h;src/source_package_publishing_history.h;src/build.h;src/binary_package_publishing_history.h;src/archive_dependency.h;src/distro_series.h;src/distro_arch_series.h;src/distro_arch_series_filter.h"
+    PUBLIC_HEADER "src/lazy_optional.h;src/launchpad.h;src/callablewrapper.h;src/archive.h;src/archive_permission.h;src/utils.h;src/person.h;src/distribution.h;src/authentication.h;src/source_package_publishing_history.h;src/build.h;src/binary_package_publishing_history.h;src/archive_dependency.h;src/distro_series.h;src/distro_arch_series.h;src/distro_arch_series_filter.h"
 )
 
 install(TARGETS launchpad