diff --git a/plugins/add-spatter.cpp b/plugins/add-spatter.cpp
index 60bcce38f..45d636d7c 100644
--- a/plugins/add-spatter.cpp
+++ b/plugins/add-spatter.cpp
@@ -244,7 +244,7 @@ struct product_hook : improvement_product {
     DEFINE_VMETHOD_INTERPOSE(
         void, produce,
         (df::unit *unit,
-         std::vector<void*> *unk,
+         std::vector<df::reaction_product*> *out_products,
          std::vector<df::item*> *out_items,
          std::vector<df::reaction_reagent*> *in_reag,
          std::vector<df::item*> *in_items,
@@ -295,7 +295,7 @@ struct product_hook : improvement_product {
             return;
         }
 
-        INTERPOSE_NEXT(produce)(unit, unk, out_items, in_reag, in_items, quantity, skill, entity, site);
+        INTERPOSE_NEXT(produce)(unit, out_products, out_items, in_reag, in_items, quantity, skill, entity, site);
     }
 };
 
diff --git a/plugins/createitem.cpp b/plugins/createitem.cpp
index 8c71dda40..33cd05f70 100644
--- a/plugins/createitem.cpp
+++ b/plugins/createitem.cpp
@@ -70,10 +70,10 @@ DFhackCExport command_result plugin_shutdown ( color_ostream &out )
 
 bool makeItem (df::reaction_product_itemst *prod, df::unit *unit, bool second_item = false)
 {
+    vector<df::reaction_product*> out_products;
     vector<df::item *> out_items;
     vector<df::reaction_reagent *> in_reag;
     vector<df::item *> in_items;
-    vector<void*> unk;
     bool is_gloves = (prod->item_type == item_type::GLOVES);
     bool is_shoes = (prod->item_type == item_type::SHOES);
 
@@ -84,7 +84,7 @@ bool makeItem (df::reaction_product_itemst *prod, df::unit *unit, bool second_it
     if (dest_building != -1)
         building = df::building::find(dest_building);
 
-    prod->produce(unit, &unk, &out_items, &in_reag, &in_items, 1, job_skill::NONE,
+    prod->produce(unit, &out_products, &out_items, &in_reag, &in_items, 1, job_skill::NONE,
         df::historical_entity::find(unit->civ_id),
         (World::isFortressMode()) ? df::world_site::find(ui->site_id) : NULL);
     if (!out_items.size())
diff --git a/plugins/diggingInvaders/assignJob.cpp b/plugins/diggingInvaders/assignJob.cpp
index 94acbd988..b7ca6f161 100644
--- a/plugins/diggingInvaders/assignJob.cpp
+++ b/plugins/diggingInvaders/assignJob.cpp
@@ -252,11 +252,11 @@ int32_t assignJob(color_ostream& out, Edge firstImportantEdge, unordered_map<df:
             prod->count = 1;
             prod->product_dimension = 1;
 
+            vector<df::reaction_product*> out_products;
             vector<df::item*> out_items;
             vector<df::reaction_reagent*> in_reag;
             vector<df::item*> in_items;
-            vector<void*> unk;
-            prod->produce(firstInvader, &unk, &out_items, &in_reag, &in_items, 1, df::job_skill::NONE,
+            prod->produce(firstInvader, &out_products, &out_items, &in_reag, &in_items, 1, df::job_skill::NONE,
                 df::historical_entity::find(firstInvader->civ_id),
                 df::world_site::find(df::global::ui->site_id));
 
diff --git a/plugins/eventful.cpp b/plugins/eventful.cpp
index 01537f57e..7ad10a3ba 100644
--- a/plugins/eventful.cpp
+++ b/plugins/eventful.cpp
@@ -310,7 +310,7 @@ struct product_hook : item_product {
     DEFINE_VMETHOD_INTERPOSE(
         void, produce,
         (df::unit *unit,
-         std::vector<void*> *unk,
+         std::vector<df::reaction_product*> *out_products,
          std::vector<df::item*> *out_items,
          std::vector<df::reaction_reagent*> *in_reag,
          std::vector<df::item*> *in_items,
@@ -320,7 +320,7 @@ struct product_hook : item_product {
         color_ostream_proxy out(Core::getInstance().getConsole());
         auto product = products[this];
         if ( !product ) {
-            INTERPOSE_NEXT(produce)(unit, unk, out_items, in_reag, in_items, quantity, skill, entity, site);
+            INTERPOSE_NEXT(produce)(unit, out_products, out_items, in_reag, in_items, quantity, skill, entity, site);
             return;
         }
         df::reaction* this_reaction=product->react;
@@ -331,7 +331,7 @@ struct product_hook : item_product {
             return;
 
         size_t out_item_count = out_items->size();
-        INTERPOSE_NEXT(produce)(unit, unk, out_items, in_reag, in_items, quantity, skill, entity, site);
+        INTERPOSE_NEXT(produce)(unit, out_products, out_items, in_reag, in_items, quantity, skill, entity, site);
         if ( out_items->size() == out_item_count )
             return;
         //if it produced something, call the scripts