diff --git a/common/config_utils.go b/common/config_utils.go
index b17e9ce..44c93f6 100644
--- a/common/config_utils.go
+++ b/common/config_utils.go
@@ -47,7 +47,9 @@ func loadFromEnvInner(prefix string, conf reflect.Value, defaultValue string) {
 }
 
 func toUnderscoreUpper(key string) string {
-	matchFirstCap := regexp.MustCompile("([a-z])([A-Z]+[a-z]+)")
+	key = strings.Trim(key, "_")
+	matchFirstCap := regexp.MustCompile("([a-z])([A-Z]+)")
 	s2 := matchFirstCap.ReplaceAllString(key, "${1}_${2}")
+	// dtmimp.Logf("loading from env: %s", strings.ToUpper(s2))
 	return strings.ToUpper(s2)
 }