diff --git a/lib/unparser/emitter/pair.rb b/lib/unparser/emitter/pair.rb
index 967361b..85f690f 100644
--- a/lib/unparser/emitter/pair.rb
+++ b/lib/unparser/emitter/pair.rb
@@ -17,7 +17,7 @@ class Pair < self
       def dispatch
         if colon?
           emit_colon
-          unless implicit_value?
+          unless implicit_value_lvar? || implicit_value_send?
             write(' ')
             visit(value)
           end
@@ -36,8 +36,16 @@ def emit_colon
         write(key.children.first.to_s, ':')
       end
 
-      def implicit_value?
-        n_lvar?(value) && value.children.first.equal?(key.children.first)
+      def key_value
+        key.children.first
+      end
+
+      def implicit_value_lvar?
+        n_lvar?(value) && value.children.first.equal?(key_value)
+      end
+
+      def implicit_value_send?
+        n_send?(value) && value.children.fetch(1).equal?(key_value)
       end
     end
   end
diff --git a/test/corpus/literal/send.rb b/test/corpus/literal/send.rb
index bba6342..20bac0c 100644
--- a/test/corpus/literal/send.rb
+++ b/test/corpus/literal/send.rb
@@ -84,3 +84,4 @@ def foo
 a&.+(b)
 a = nil
 foo(bar: a)
+foo(return:)