diff --git a/init.lua b/init.lua
index 52f287f..88ac2ea 100644
--- a/init.lua
+++ b/init.lua
@@ -84,7 +84,7 @@ if(minetest.setting_getbool("enable_damage") == true) then
 				minetest.chat_send_player(name, S("This is not a number."))
 				return
 			end
-			hp = math.floor(hp+0.5)	-- round the number
+			hp = math.max(0, math.floor(hp+0.5)) -- round the number, ensure minimum value of 0
 			player:set_hp(tonumber(hp))
 		end,
 	})
@@ -107,7 +107,7 @@ if(minetest.setting_getbool("enable_damage") == true) then
 				return
 			end
 			local hp = tonumber(hearts) * 2
-			hp = math.floor(hp+0.5)	-- round the number
+			hp = math.max(0, math.floor(hp+0.5)) -- round the number, ensure minimum value of 0
 			player:set_hp(hp)
 		end,
 	})
@@ -129,7 +129,7 @@ if(minetest.setting_getbool("enable_damage") == true) then
 				minetest.chat_send_player(name, S("This is not a number."))
 				return
 			end
-			local bp = tonumber(breath)
+			local bp = math.max(0, tonumber(breath)) -- ensure minimum value of 0
 			player:set_breath(bp)
 		end,
 	})