Try moving distro_series down in the header file

src/source_package_publishing_history.h

@@ -43,7 +43,6 @@ public:
     void parse_json(const std::string& json_data);
 
     std::generator<build> getBuilds() const;
-    lazy_optional<::distro_series, std::function<std::optional<::distro_series>()>> distro_series;
     std::generator<binary_package_publishing_history> getPublishedBinaries(bool active_binaries_only = false) const;
 
     bool requestDeletion(const std::string& removal_comment = "");
@@ -55,6 +54,7 @@ public:
     std::string source_package_version;
 
     void set_lp(launchpad* lp_ptr);
+    lazy_optional<::distro_series, std::function<std::optional<::distro_series>()>> distro_series;
 
 private:
     launchpad* lp;