diff --git a/minetest/colorspec.lua b/minetest/colorspec.lua
index b5656c8..166015c 100644
--- a/minetest/colorspec.lua
+++ b/minetest/colorspec.lua
@@ -210,7 +210,7 @@ function colorspec.from_string(string)
 			if not number then
 				return
 			end
-			alpha = tonumber(alpha_text, 16)
+			alpha = tonumber(alpha_text, 0x10)
 		end
 	end
 	if number then
@@ -220,7 +220,7 @@ function colorspec.from_string(string)
 	if not hex_text then
 		return
 	end
-	local len, num = hex_text:len(), tonumber(hex_text, 16)
+	local len, num = hex_text:len(), tonumber(hex_text, 0x10)
 	if len == 8 then
 		return colorspec.from_number_rgba(num)
 	end
@@ -229,17 +229,17 @@ function colorspec.from_string(string)
 	end
 	if len == 4 then
 		return colorspec.from_table{
-			a = (num % 16) * 17,
-			b = (floor(num / 16) % 16) * 17,
-			g = (floor(num / (16 ^ 2)) % 16) * 17,
-			r = (floor(num / (16 ^ 3)) % 16) * 17
+			a = (num % 0x10) * 0x11,
+			b = (floor(num / 0x10) % 0x10) * 0x11,
+			g = (floor(num / (0x100)) % 0x10) * 0x11,
+			r = (floor(num / (0x1000)) % 0x10) * 0x11
 		}
 	end
 	if len == 3 then
 		return colorspec.from_table{
-			b = (num % 16) * 17,
-			g = (floor(num / 16) % 16) * 17,
-			r = (floor(num / (16 ^ 2)) % 16) * 17
+			b = (num % 0x10) * 0x11,
+			g = (floor(num / 0x10) % 0x10) * 0x11,
+			r = (floor(num / (0x100)) % 0x10) * 0x11
 		}
 	end
 end