diff --git a/main.go b/main.go
index a60d6c7..f2473b5 100644
--- a/main.go
+++ b/main.go
@@ -138,6 +138,6 @@ func main() {
 		os.Exit(1)
 	}
 
-	gha.SetOutput("image-tag", fmt.Sprintf("%s.%s", date, shortHash))
+	gha.SetOutput("image-tag", fmt.Sprintf("nightly-%s.%s", date, shortHash))
 	gha.SetOutput("full-image-name", tagLatest)
 }