diff --git a/main.go b/main.go
index 423e478..b451a2a 100644
--- a/main.go
+++ b/main.go
@@ -373,7 +373,7 @@ func main() {
 	log.Info("Starting ObjectiveFS Volume Driver, version " + version)
 
 	defEnv := make(map[string]string)
-	for _, i := range []string{"ACCESS_KEY", "SECRET_KEY", "OBJECTIVEFS_LICENSE", "OBJECTSTORE", "ENDPOINT", "CACHESIZE", "DISKCACHE_SIZE", "DISKCACHE_PATH", "OBJECTIVEFS_PASSPHRASE"} {
+	for _, i := range []string{"ACCESS_KEY", "SECRET_KEY", "OBJECTIVEFS_LICENSE", "OBJECTSTORE", "ENDPOINT", "CACHESIZE", "DISKCACHE_SIZE", "DISKCACHE_PATH", "OBJECTIVEFS_PASSPHRASE", "IDMAP"} {
 		if a := os.Getenv(i); a != "" {
 			defEnv[i] = a
 		}