diff --git a/src/backends/reference/workloads/CMakeLists.txt b/src/backends/reference/workloads/CMakeLists.txt
index 3c0af01..696605d 100644
--- a/src/backends/reference/workloads/CMakeLists.txt
+++ b/src/backends/reference/workloads/CMakeLists.txt
@@ -28,6 +28,7 @@
     Gather.cpp
     Gather.hpp
     LstmUtils.hpp
+    LstmUtils.cpp
     Maximum.hpp
     Mean.cpp
     Mean.hpp