diff --git a/transpile/mapping.go b/transpile/mapping.go
index 5196042..9bbcc6b 100644
--- a/transpile/mapping.go
+++ b/transpile/mapping.go
@@ -60,7 +60,7 @@ var mapping = map[string]string{
 	"wifi.StatusScanCompleted":       "WL_SCAN_COMPLETED",
 	"Loop":                           "loop",
 	"Setup":                          "setup",
-	"arduino.Millis":                 "millis",
+	"timer.Millis":                   "millis",
 	"arduino.A0":                     "A0",
 	"arduino.A1":                     "A1",
 	"arduino.A2":                     "A2",