diff --git a/environment_driver.lua b/environment_driver.lua
index 214c5fc..836bceb 100644
--- a/environment_driver.lua
+++ b/environment_driver.lua
@@ -1,7 +1,7 @@
 
 local function getValue(env)
     local value = env.getRadiation()
-    local stringValue = value.radiation .. value.unit
+    local stringValue = toString(value.radiation) .. toString(value.unit)
     return stringValue
 end