diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5115480..960c4c8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.0.138)
+project(blt-gp VERSION 0.0.139)
 
 include(CTest)
 
diff --git a/include/blt/gp/program.h b/include/blt/gp/program.h
index 6dce563..f044f4a 100644
--- a/include/blt/gp/program.h
+++ b/include/blt/gp/program.h
@@ -150,7 +150,10 @@ namespace blt::gp
                             alloc.call_destructors<Args...>(mask);
                             break;
                         case detail::destroy_t::RETURN:
-                            alloc.from<detail::remove_cv_ref<Return>>(0).drop();
+                            if constexpr (detail::has_func_drop_v<remove_cvref_t<Return>>)
+                            {
+                                alloc.from<detail::remove_cv_ref<Return>>(0).drop();
+                            }
                             break;
                     }
                 });