diff --git a/code/datums/components/material_container.dm b/code/datums/components/material_container.dm
index 19d3ee6ab54..c8f54a1f0c3 100644
--- a/code/datums/components/material_container.dm
+++ b/code/datums/components/material_container.dm
@@ -267,6 +267,7 @@
 		if(!istype(mat))
 			mat = GET_MATERIAL_REF(mat)
 		materials[mat] += amt
+		total_amount += amt
 	else
 		var/num_materials = length(materials)
 		if(!num_materials)