diff --git a/base/src/functions/mod.rs b/base/src/functions/mod.rs
index 8397fd1..d0eb934 100644
--- a/base/src/functions/mod.rs
+++ b/base/src/functions/mod.rs
@@ -569,7 +569,7 @@ impl Function {
             "SEARCH" => Some(Function::Search),
             "TEXT" => Some(Function::Text),
             "TRIM" => Some(Function::Trim),
-            "UNICODE" => Some(Function::Unicode),
+            "UNICODE" | "_XLFN.UNICODE" => Some(Function::Unicode),
             "UPPER" => Some(Function::Upper),
 
             "REPT" => Some(Function::Rept),
diff --git a/base/src/test/test_fn_unicode.rs b/base/src/test/test_fn_unicode.rs
index efb588a..31469d9 100644
--- a/base/src/test/test_fn_unicode.rs
+++ b/base/src/test/test_fn_unicode.rs
@@ -15,6 +15,8 @@ fn simple_cases() {
     model._set("A8", "=UNICODE(\"の\")");
     model._set("A9", "=UNICODE(\" \")");
 
+    model._set("A10", "=_xlfn.UNICODE(\"T\")");
+
     model.evaluate();
 
     assert_eq!(model._get_text("A1"), *"49");
@@ -26,6 +28,7 @@ fn simple_cases() {
     assert_eq!(model._get_text("A7"), *"70");
     assert_eq!(model._get_text("A8"), *"12398");
     assert_eq!(model._get_text("A9"), *"32");
+    assert_eq!(model._get_text("A10"), *"84");
 }
 
 #[test]