diff --git a/neo-cli/Shell/MainService.cs b/neo-cli/Shell/MainService.cs
index 25a6425eb..7523166de 100644
--- a/neo-cli/Shell/MainService.cs
+++ b/neo-cli/Shell/MainService.cs
@@ -222,7 +222,7 @@ private byte[] LoadDeploymentScript(string nefFilePath, string manifestFilePath,
         {
             if (string.IsNullOrEmpty(manifestFilePath))
             {
-                manifestFilePath = Path.ChangeExtension(nefFilePath, ".manifest" + Path.GetExtension(nefFilePath));
+                manifestFilePath = Path.ChangeExtension(nefFilePath, ".manifest.json");
             }
 
             // Read manifest