diff --git a/machines/rotary_macerator.lua b/machines/rotary_macerator.lua
index db3e8b1..d0f430d 100644
--- a/machines/rotary_macerator.lua
+++ b/machines/rotary_macerator.lua
@@ -37,7 +37,7 @@ rotaryMacerator.getFormspec=function(pos)
 			 or "image[4.9,2.8;1,1;gui_furnace_arrow_bg.png^[transformR270]"),
 			"list[context;dst;6,2.8;1,1;]",
 			"list[context;upgrades;9,0.9;1,4]",
-			"label[0.5,2.8;Speed: "..rpm.."]",
+			"label[0.5,2.8;"..minetest.formspec_escape(S("Speed: @1",rpm)).."]",
 			"listring[context;src]",
 			"listring[context;modifier]",
 			"listring[context;powerStorage]",
@@ -60,7 +60,7 @@ rotaryMacerator.getFormspec=function(pos)
 			mcl_formspec.get_itemslot_bg(6,2.8,1,1),
 			"list[context;upgrades;9,0.9;1,4]",
 			mcl_formspec.get_itemslot_bg(9,0.9,1,4),
-			"label[0.5,2.8;Speed: "..rpm.."]",
+			"label[0.5,2.8;"..minetest.formspec_escape(S("Speed: @1",rpm)).."]",
 			"listring[context;src]",
 			"listring[context;modifier]",
 			"listring[context;powerStorage]",