diff --git a/cpp/src/arrow/acero/test_util_internal.cc b/cpp/src/arrow/acero/test_util_internal.cc
index 3e2791758104..5e3b582efc70 100644
--- a/cpp/src/arrow/acero/test_util_internal.cc
+++ b/cpp/src/arrow/acero/test_util_internal.cc
@@ -121,7 +121,7 @@ struct DummyNode : ExecNode {
  private:
   void AssertIsOutput(ExecNode* output) { ASSERT_EQ(output->output(), nullptr); }
 
-  std::shared_ptr<Schema> dummy_schema() const {
+  static std::shared_ptr<Schema> dummy_schema() {
     return schema({field("dummy", null())});
   }