diff --git a/Sources/Then/Then.swift b/Sources/Then/Then.swift
index fa0da8c..e83594a 100644
--- a/Sources/Then/Then.swift
+++ b/Sources/Then/Then.swift
@@ -68,6 +68,7 @@ extension Then where Self: AnyObject {
   ///       $0.textColor = UIColor.black
   ///       $0.text = "Hello, World!"
   ///     }
+  @discardableResult
   @inlinable
   public func then(_ block: (Self) throws -> Void) rethrows -> Self {
     try block(self)