diff --git a/datafusion/expr/src/test/function_stub.rs b/datafusion/expr/src/test/function_stub.rs
index ab34089bef83..e8952f721bb7 100644
--- a/datafusion/expr/src/test/function_stub.rs
+++ b/datafusion/expr/src/test/function_stub.rs
@@ -427,7 +427,7 @@ impl AggregateUDFImpl for Max {
     }
 
     fn name(&self) -> &str {
-        "MIN"
+        "MAX"
     }
 
     fn signature(&self) -> &Signature {