diff --git a/src/dynamic/sample/SampleDynamicBackend.cpp b/src/dynamic/sample/SampleDynamicBackend.cpp
index ce4d2df..4f048d0 100644
--- a/src/dynamic/sample/SampleDynamicBackend.cpp
+++ b/src/dynamic/sample/SampleDynamicBackend.cpp
@@ -11,6 +11,8 @@
 
 #include <armnn/backends/IBackendInternal.hpp>
 #include <armnn/backends/OptimizationViews.hpp>
+#include <armnn/utility/PolymorphicDowncast.hpp>
+#include <backendsCommon/TensorHandleFactoryRegistry.hpp>
 
 namespace sdb // sample dynamic backend
 {