diff --git a/minetest/colorspec.lua b/minetest/colorspec.lua
index 3658b12..b5816ae 100644
--- a/minetest/colorspec.lua
+++ b/minetest/colorspec.lua
@@ -255,9 +255,9 @@ end
 --> hex string, omits alpha if possible (if opaque)
 function colorspec:to_string()
 	if self.a == 255 then
-		return ("%02X02X02X"):format(self.r, self.g, self.b)
+		return ("%02X%02X%02X"):format(self.r, self.g, self.b)
 	end
-	return ("%02X02X02X02X"):format(self.r, self.g, self.b, self.a)
+	return ("%02X%02X%02X%02X"):format(self.r, self.g, self.b, self.a)
 end
 
 function colorspec:to_number()
diff --git a/test.lua b/test.lua
index 34d776f..2efc621 100644
--- a/test.lua
+++ b/test.lua
@@ -267,6 +267,7 @@ test_from_string("aliceblue#42", 0xf0f8ff42)
 test_from_string("#333", 0x333333FF)
 test_from_string("#694269", 0x694269FF)
 test_from_string("#11223344", 0x11223344)
+assert(colorspec.from_string"#694269":to_string() == "694269")
 
 local function test_logfile(reference_strings)
 	local logfile = persistence.lua_log_file.new(mod.get_resource"logfile.test.lua", {}, reference_strings)