arm_compute v17.12
diff --git a/src/runtime/CL/functions/CLActivationLayer.cpp b/src/runtime/CL/functions/CLActivationLayer.cpp
index b64739a..eaf2ca5 100644
--- a/src/runtime/CL/functions/CLActivationLayer.cpp
+++ b/src/runtime/CL/functions/CLActivationLayer.cpp
@@ -24,6 +24,7 @@
 #include "arm_compute/runtime/CL/functions/CLActivationLayer.h"
 
 #include "arm_compute/core/CL/kernels/CLActivationLayerKernel.h"
+#include "arm_compute/core/Types.h"
 #include "support/ToolchainSupport.h"
 
 using namespace arm_compute;
@@ -34,3 +35,8 @@
     k->configure(input, output, act_info);
     _kernel = std::move(k);
 }
+
+Status CLActivationLayer::validate(const ITensorInfo *input, const ITensorInfo *output, const ActivationLayerInfo &act_info)
+{
+    return CLActivationLayerKernel::validate(input, output, act_info);
+}