diff --git a/viper.go b/viper.go
index a3812e9..22d82d1 100644
--- a/viper.go
+++ b/viper.go
@@ -1286,7 +1286,7 @@ func (v *Viper) find(lcaseKey string, flagDefault bool) interface{} {
 	envkeys, exists := v.env[lcaseKey]
 	if exists {
 		for _, envkey := range envkeys {
-			if val, ok := v.getEnv(envkey); ok {
+			if val, ok := v.getEnv(strings.ToUpper(envkey)); ok {
 				return val
 			}
 		}