diff --git a/tests/validation/reference/ActivationLayer.h b/tests/validation/reference/ActivationLayer.h
index 5beca7c..2d5dfdf 100644
--- a/tests/validation/reference/ActivationLayer.h
+++ b/tests/validation/reference/ActivationLayer.h
@@ -66,6 +66,9 @@
         case ActivationLayerInfo::ActivationFunction::SOFT_RELU:
             ret = std::log(static_cast<T>(1) + std::exp(x));
             break;
+        case ActivationLayerInfo::ActivationFunction::ELU:
+            ret = (x > 0) ? x : a * (std::exp(x) - static_cast<T>(1));
+            break;
         case ActivationLayerInfo::ActivationFunction::SQRT:
             ret = std::sqrt(x);
             break;