diff --git a/crates/nu-parser/src/type_check.rs b/crates/nu-parser/src/type_check.rs
index 1c76afb621..872bb6a94c 100644
--- a/crates/nu-parser/src/type_check.rs
+++ b/crates/nu-parser/src/type_check.rs
@@ -292,7 +292,7 @@ pub fn math_result_type(
                 (Type::Filesize, Type::Filesize) => (Type::Float, None),
                 (Type::Filesize, Type::Int) => (Type::Filesize, None),
                 (Type::Filesize, Type::Float) => (Type::Filesize, None),
-                (Type::Duration, Type::Duration) => (Type::Float, None),
+                (Type::Duration, Type::Duration) => (Type::Duration, None),
                 (Type::Duration, Type::Int) => (Type::Duration, None),
                 (Type::Duration, Type::Float) => (Type::Duration, None),