diff --git a/experimental/Intersection/TestUtilities.cpp b/experimental/Intersection/TestUtilities.cpp
index 95ed1e0..0477ed4 100644
--- a/experimental/Intersection/TestUtilities.cpp
+++ b/experimental/Intersection/TestUtilities.cpp
@@ -4,6 +4,8 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
+#include "CubicUtilities.h"
 #include "CurveIntersection.h"
 #include "TestUtilities.h"