diff --git a/src/mlpack/tests/activation_functions_test.cpp b/src/mlpack/tests/activation_functions_test.cpp
index 642aa84dc4..2a64068891 100644
--- a/src/mlpack/tests/activation_functions_test.cpp
+++ b/src/mlpack/tests/activation_functions_test.cpp
@@ -1052,7 +1052,7 @@ TEST_CASE("ISRLUFunctionTest", "[ActivationFunctionsTest]")
                                          0.54433105 1 1");
 
   CheckISRLUActivationCorrect(activationData, desiredActivations);
-  CheckISRLUDerivativeCorrect(desiredActivations, desiredDerivatives);
+  CheckISRLUDerivativeCorrect(activationData, desiredDerivatives);
 }
 
 /**