diff --git a/include/ceres/autodiff_cost_function.h b/include/ceres/autodiff_cost_function.h
index 0ac6240..6e51115 100644
--- a/include/ceres/autodiff_cost_function.h
+++ b/include/ceres/autodiff_cost_function.h
@@ -151,7 +151,7 @@
                         double** jacobians) const {
     if (!jacobians) {
       return internal::VariadicEvaluate<
-          CostFunctor, double, M, N0, N1, N2, N3, N4, N5>
+          CostFunctor, double, N0, N1, N2, N3, N4, N5>
           ::Call(*functor_, parameters, residuals);
     }
     return internal::AutoDiff<CostFunctor, double,
diff --git a/include/ceres/internal/autodiff.h b/include/ceres/internal/autodiff.h
index 1a9d396..0dc0d4f 100644
--- a/include/ceres/internal/autodiff.h
+++ b/include/ceres/internal/autodiff.h
@@ -208,7 +208,7 @@
 // Supporting variadic functions is the primary source of complexity in the
 // autodiff implementation.
 
-template<typename Functor, typename T, int kNumOutputs,
+template<typename Functor, typename T,
          int N0, int N1, int N2, int N3, int N4, int N5>
 struct VariadicEvaluate {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
@@ -222,9 +222,9 @@
   }
 };
 
-template<typename Functor, typename T, int kNumOutputs,
+template<typename Functor, typename T,
          int N0, int N1, int N2, int N3, int N4>
-struct VariadicEvaluate<Functor, T, kNumOutputs, N0, N1, N2, N3, N4, 0> {
+struct VariadicEvaluate<Functor, T, N0, N1, N2, N3, N4, 0> {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
     return functor(input[0],
                    input[1],
@@ -235,9 +235,9 @@
   }
 };
 
-template<typename Functor, typename T, int kNumOutputs,
+template<typename Functor, typename T,
          int N0, int N1, int N2, int N3>
-struct VariadicEvaluate<Functor, T, kNumOutputs, N0, N1, N2, N3, 0, 0> {
+struct VariadicEvaluate<Functor, T, N0, N1, N2, N3, 0, 0> {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
     return functor(input[0],
                    input[1],
@@ -247,9 +247,9 @@
   }
 };
 
-template<typename Functor, typename T, int kNumOutputs,
+template<typename Functor, typename T,
          int N0, int N1, int N2>
-struct VariadicEvaluate<Functor, T, kNumOutputs, N0, N1, N2, 0, 0, 0> {
+struct VariadicEvaluate<Functor, T, N0, N1, N2, 0, 0, 0> {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
     return functor(input[0],
                    input[1],
@@ -258,9 +258,9 @@
   }
 };
 
-template<typename Functor, typename T, int kNumOutputs,
+template<typename Functor, typename T,
          int N0, int N1>
-struct VariadicEvaluate<Functor, T, kNumOutputs, N0, N1, 0, 0, 0, 0> {
+struct VariadicEvaluate<Functor, T, N0, N1, 0, 0, 0, 0> {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
     return functor(input[0],
                    input[1],
@@ -268,8 +268,8 @@
   }
 };
 
-template<typename Functor, typename T, int kNumOutputs, int N0>
-struct VariadicEvaluate<Functor, T, kNumOutputs, N0, 0, 0, 0, 0, 0> {
+template<typename Functor, typename T, int N0>
+struct VariadicEvaluate<Functor, T, N0, 0, 0, 0, 0, 0> {
   static bool Call(const Functor& functor, T const *const *input, T* output) {
     return functor(input[0],
                    output);
@@ -339,7 +339,7 @@
     CERES_MAKE_1ST_ORDER_PERTURBATION(5);
 #undef CERES_MAKE_1ST_ORDER_PERTURBATION
 
-    if (!VariadicEvaluate<Functor, JetT, kNumOutputs,
+    if (!VariadicEvaluate<Functor, JetT,
                           N0, N1, N2, N3, N4, N5>::Call(
         functor, unpacked_parameters, output)) {
       return false;