diff --git a/mrblib/array.rb b/mrblib/array.rb
index d151d9350..76c137421 100644
--- a/mrblib/array.rb
+++ b/mrblib/array.rb
@@ -193,7 +193,7 @@ class Array
   def delete(key, &block)
     len = self.length
     ret = self.__delete(key)
-    return block&.call() if len == self.length
+    return block&.call(key) if len == self.length
 
     ret
   end
diff --git a/test/t/array.rb b/test/t/array.rb
index eccb435ef..b40c03dd7 100644
--- a/test/t/array.rb
+++ b/test/t/array.rb
@@ -445,3 +445,16 @@ assert('Array#freeze') do
     a[0] = 1
   end
 end
+
+assert('Array#delete') do
+  a = ["a", "b", "c"]
+  assert_equal nil, a.delete("x")
+  assert_equal "x", a.delete("x") { _1 }
+  assert_equal ["a", "b", "c"], a
+  assert_equal "a", a.delete("a")
+  assert_equal ["b", "c"], a
+
+  a = [nil]
+  assert_equal nil, a.delete(nil) { "?" }
+  assert_equal [], a
+end