diff --git a/BeefySysLib/CMakeLists.txt b/BeefySysLib/CMakeLists.txt
index 961a72b4..ef8f5391 100644
--- a/BeefySysLib/CMakeLists.txt
+++ b/BeefySysLib/CMakeLists.txt
@@ -282,6 +282,7 @@ file(GLOB SRC_FILES
     util/CubicSpline.cpp
     util/FileEnumerator.cpp
     util/Hash.cpp
+    util/Heap.cpp
     util/Json.cpp
     util/MappedFile.cpp
     util/Matrix4.cpp