diff --git a/spec/examples/argument b/spec/examples/argument
index bee51852..aee4d702 100644
--- a/spec/examples/argument
+++ b/spec/examples/argument
@@ -48,4 +48,9 @@ component Main {
     test()
   }
 }
-
+-------------------------------------------------------------------------------
+component Main {
+  fun render : String {
+    (value: String) { value }("")
+  }
+}
diff --git a/src/parsers/base_expression.cr b/src/parsers/base_expression.cr
index 60f5130c..9742a853 100644
--- a/src/parsers/base_expression.cr
+++ b/src/parsers/base_expression.cr
@@ -10,7 +10,8 @@ module Mint
       left =
         case char
         when '('
-          parenthesized_expression || inline_function
+          # TODO: Remove `oneof` when `:` deprecation ends.
+          oneof { parenthesized_expression || inline_function }
         when '-', .ascii_number?
           state_setter || number_literal || unary_minus
         when '!'