diff --git a/cmake/QtPublicSbomFileHelpers.cmake b/cmake/QtPublicSbomFileHelpers.cmake
index edc01412983..7863a473159 100644
--- a/cmake/QtPublicSbomFileHelpers.cmake
+++ b/cmake/QtPublicSbomFileHelpers.cmake
@@ -730,6 +730,7 @@ function(_qt_internal_sbom_add_custom_file target installed_file_relative_path)
         FILENAME "${installed_file_relative_path}"
         FILETYPE "${file_type}" ${optional}
         SPDXID "${spdx_id}"
+        PARENT_PACKAGE_SPDXID "${arg_PACKAGE_SPDX_ID}"
         ${file_common_options}
         ${config_to_install_option}
         ${relationship_option}
diff --git a/cmake/QtPublicSbomGenerationHelpers.cmake b/cmake/QtPublicSbomGenerationHelpers.cmake
index 351b69ad451..03b720a048e 100644
--- a/cmake/QtPublicSbomGenerationHelpers.cmake
+++ b/cmake/QtPublicSbomGenerationHelpers.cmake
@@ -589,6 +589,8 @@ function(_qt_internal_sbom_generate_add_file)
         HINTS "SPDXRef-${arg_FILENAME}"
     )
 
+    _qt_internal_sbom_set_default_option_value_and_error_if_empty(PARENT_PACKAGE_SPDXID "")
+
     _qt_internal_sbom_set_default_option_value(LICENSE "NOASSERTION")
     _qt_internal_sbom_set_default_option_value(COPYRIGHT "NOASSERTION")