diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f21ce4c5..4839e4f25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,7 +42,7 @@ target_include_directories(ensmallen INTERFACE
 if(MSVC)
   target_compile_options(ensmallen INTERFACE $<BUILD_INTERFACE:/Wall>)
 else()
-  target_compile_options(ensmallen INTERFACE $<BUILD_INTERFACE:-Wall -Wpedantic -Wunused-parameter>)
+  target_compile_options(ensmallen INTERFACE $<BUILD_INTERFACE:-Wall -Wpedantic -Wunused-parameter -Wunused-variable -Wunused-private-field>)
 endif()
 
 # Find OpenMP and link it.
diff --git a/include/ensmallen_bits/agemoea/agemoea.hpp b/include/ensmallen_bits/agemoea/agemoea.hpp
index f7c5c2f79..9f914dac0 100644
--- a/include/ensmallen_bits/agemoea/agemoea.hpp
+++ b/include/ensmallen_bits/agemoea/agemoea.hpp
@@ -452,12 +452,6 @@ class AGEMOEA
   //! Probability that crossover will occur.
   double crossoverProb;
 
-  //! Probability that mutation will occur.
-  double mutationProb;
-
-  //! Strength of the mutation.
-  double mutationStrength;
-
   //! The crowding degree of the mutation. Higher value produces a mutant
   //! resembling its parent.
   double distributionIndex;
diff --git a/include/ensmallen_bits/problems/dtlz/dtlz2_function.hpp b/include/ensmallen_bits/problems/dtlz/dtlz2_function.hpp
index d73de1996..6b9dcd23c 100644
--- a/include/ensmallen_bits/problems/dtlz/dtlz2_function.hpp
+++ b/include/ensmallen_bits/problems/dtlz/dtlz2_function.hpp
@@ -110,7 +110,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/dtlz/dtlz4_function.hpp b/include/ensmallen_bits/problems/dtlz/dtlz4_function.hpp
index cc06cb624..efcf381f0 100644
--- a/include/ensmallen_bits/problems/dtlz/dtlz4_function.hpp
+++ b/include/ensmallen_bits/problems/dtlz/dtlz4_function.hpp
@@ -113,7 +113,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/dtlz/dtlz5_function.hpp b/include/ensmallen_bits/problems/dtlz/dtlz5_function.hpp
index c27926beb..1a4126d81 100644
--- a/include/ensmallen_bits/problems/dtlz/dtlz5_function.hpp
+++ b/include/ensmallen_bits/problems/dtlz/dtlz5_function.hpp
@@ -110,7 +110,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/dtlz/dtlz6_function.hpp b/include/ensmallen_bits/problems/dtlz/dtlz6_function.hpp
index 812db4700..c56fd7be1 100644
--- a/include/ensmallen_bits/problems/dtlz/dtlz6_function.hpp
+++ b/include/ensmallen_bits/problems/dtlz/dtlz6_function.hpp
@@ -110,7 +110,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/dtlz/dtlz7_function.hpp b/include/ensmallen_bits/problems/dtlz/dtlz7_function.hpp
index 436531891..99a262f0f 100644
--- a/include/ensmallen_bits/problems/dtlz/dtlz7_function.hpp
+++ b/include/ensmallen_bits/problems/dtlz/dtlz7_function.hpp
@@ -131,7 +131,6 @@ namespace test {
       arma::Row<typename MatType::elem_type> h(
           const MatType& coords, const arma::Row<typename MatType::elem_type>& G)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/maf/maf5_function.hpp b/include/ensmallen_bits/problems/maf/maf5_function.hpp
index 65c1b8d33..db8c16f2d 100644
--- a/include/ensmallen_bits/problems/maf/maf5_function.hpp
+++ b/include/ensmallen_bits/problems/maf/maf5_function.hpp
@@ -131,7 +131,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;
diff --git a/include/ensmallen_bits/problems/maf/maf6_function.hpp b/include/ensmallen_bits/problems/maf/maf6_function.hpp
index e443e5c81..2ace86498 100644
--- a/include/ensmallen_bits/problems/maf/maf6_function.hpp
+++ b/include/ensmallen_bits/problems/maf/maf6_function.hpp
@@ -116,7 +116,6 @@ namespace test {
        */
       arma::Row<typename MatType::elem_type> g(const MatType& coords)
       {
-        size_t k = numVariables - numObjectives + 1;
 
         // Convenience typedef.
         typedef typename MatType::elem_type ElemType;