diff --git a/main.go b/main.go
index 8d5f3e4..d5d9eab 100644
--- a/main.go
+++ b/main.go
@@ -45,6 +45,7 @@ func (c *Config) Define(key string, dtype DataType) {
     entry, ok := c.env[upper]
     if ok {
         entry.dtype = dtype
+        c.env[upper] = entry
     } else {
         var entry cEntry
         entry.dtype = dtype
@@ -62,6 +63,7 @@ func (c *Config) DefineDefault(key string, val string, dtype DataType) {
             entry.empty = false
             entry.value = val
             entry.dtype = dtype
+            c.env[upper] = entry
         }
     } else {
         var entry cEntry