diff --git a/arm_compute/graph/nodes/NodesFwd.h b/arm_compute/graph/nodes/NodesFwd.h
index f956b54..542c129 100644
--- a/arm_compute/graph/nodes/NodesFwd.h
+++ b/arm_compute/graph/nodes/NodesFwd.h
@@ -39,6 +39,7 @@
 class ConvolutionLayerNode;
 class DeconvolutionLayerNode;
 class DepthwiseConvolutionLayerNode;
+class DetectionOutputLayerNode;
 class DummyNode;
 class EltwiseLayerNode;
 class FlattenLayerNode;