diff --git a/plugins/lua/workflow.lua b/plugins/lua/workflow.lua
index 9122f290d..b3b5d80f5 100644
--- a/plugins/lua/workflow.lua
+++ b/plugins/lua/workflow.lua
@@ -206,17 +206,16 @@ local plant_products = {
 }
 
 for job,flag in pairs(plant_products) do
-    local ttag = 'type_'..string.lower(flag)
-    local itag = 'idx_'..string.lower(flag)
+    local tag = string.lower(flag)
     job_outputs[job] = function(callback, job)
         local mat_type, mat_index = -1, -1
         local seed_type, seed_index = -1, -1
         local mat = dfhack.matinfo.decode(job.job_items[0])
         if mat and mat.plant and mat.plant.flags[flag] then
-            mat_type = mat.plant.material_defs[ttag]
-            mat_index = mat.plant.material_defs[itag]
-            seed_type = mat.plant.material_defs['type_seed']
-            seed_index = mat.plant.material_defs['idx_seed']
+            mat_type = mat.plant.material_defs.type[tag]
+            mat_index = mat.plant.material_defs.idx[tag]
+            seed_type = mat.plant.material_defs.type.seed
+            seed_index = mat.plant.material_defs.idx.seed
         end
         local mat_mask = { }
         if flag ~= 'LEAVES' then