diff --git a/cpp/subprojects/boosting/src/boosting/statistics/statistics_example_wise_common.hpp b/cpp/subprojects/boosting/src/boosting/statistics/statistics_example_wise_common.hpp
index 0cad5ad5e9..b0d1a75bfe 100644
--- a/cpp/subprojects/boosting/src/boosting/statistics/statistics_example_wise_common.hpp
+++ b/cpp/subprojects/boosting/src/boosting/statistics/statistics_example_wise_common.hpp
@@ -239,7 +239,7 @@ namespace boosting {
             template<typename T>
             class StatisticsSubset final :
                     public AbstractExampleWiseImmutableStatistics<StatisticVector, Histogram, ScoreMatrix,
-                                                                  RuleEvaluationFactory>::AbstractStatisticsSubset<T> {
+                                                                  RuleEvaluationFactory>::template AbstractStatisticsSubset<T> {
 
                 private:
 
@@ -264,7 +264,7 @@ namespace boosting {
                                      std::unique_ptr<IRuleEvaluation<StatisticVector>> ruleEvaluationPtr,
                                      const T& labelIndices)
                         : AbstractExampleWiseImmutableStatistics<StatisticVector, Histogram, ScoreMatrix,
-                                                                 RuleEvaluationFactory>::AbstractStatisticsSubset<T>(
+                                                                 RuleEvaluationFactory>::template AbstractStatisticsSubset<T>(
                               histogram, totalSumVector, std::move(ruleEvaluationPtr), labelIndices),
                           histogram_(histogram), totalCoverableSumVector_(nullptr) {
 
@@ -403,8 +403,8 @@ namespace boosting {
              */
             template<typename T>
             class StatisticsSubset final :
-                    public AbstractExampleWiseImmutableStatistics<StatisticVector, StatisticView,
-                                                                  ScoreMatrix, ExampleWiseRuleEvaluationFactory>::AbstractStatisticsSubset<T> {
+                    public AbstractExampleWiseImmutableStatistics<StatisticVector, StatisticView, ScoreMatrix,
+                                                                  ExampleWiseRuleEvaluationFactory>::template AbstractStatisticsSubset<T> {
 
                 private:
 
@@ -429,7 +429,7 @@ namespace boosting {
                                      std::unique_ptr<IRuleEvaluation<StatisticVector>> ruleEvaluationPtr,
                                      const T& labelIndices)
                         : AbstractExampleWiseImmutableStatistics<StatisticVector, StatisticView, ScoreMatrix,
-                                                                 ExampleWiseRuleEvaluationFactory>::AbstractStatisticsSubset<T>(
+                                                                 ExampleWiseRuleEvaluationFactory>::template AbstractStatisticsSubset<T>(
                               statistics, totalSumVector, std::move(ruleEvaluationPtr), labelIndices),
                           totalCoverableSumVector_(nullptr) {
 
diff --git a/cpp/subprojects/boosting/src/boosting/statistics/statistics_label_wise_common.hpp b/cpp/subprojects/boosting/src/boosting/statistics/statistics_label_wise_common.hpp
index 9ac6e33a90..fc45fde4e4 100644
--- a/cpp/subprojects/boosting/src/boosting/statistics/statistics_label_wise_common.hpp
+++ b/cpp/subprojects/boosting/src/boosting/statistics/statistics_label_wise_common.hpp
@@ -228,7 +228,7 @@ namespace boosting {
             template<typename T>
             class StatisticsSubset final :
                     public AbstractLabelWiseImmutableStatistics<StatisticVector, Histogram, ScoreMatrix,
-                                                                RuleEvaluationFactory>::AbstractStatisticsSubset<T> {
+                                                                RuleEvaluationFactory>::template AbstractStatisticsSubset<T> {
 
                 private:
 
@@ -252,7 +252,7 @@ namespace boosting {
                     StatisticsSubset(const LabelWiseHistogram& histogram, const StatisticVector* totalSumVector,
                             std::unique_ptr<IRuleEvaluation<StatisticVector>> ruleEvaluationPtr, const T& labelIndices)
                         : AbstractLabelWiseImmutableStatistics<StatisticVector, Histogram, ScoreMatrix,
-                                                               RuleEvaluationFactory>::AbstractStatisticsSubset<T>(
+                                                               RuleEvaluationFactory>::template AbstractStatisticsSubset<T>(
                               histogram, totalSumVector, std::move(ruleEvaluationPtr), labelIndices),
                           histogram_(histogram), totalCoverableSumVector_(nullptr) {
 
@@ -379,7 +379,7 @@ namespace boosting {
             template<typename T>
             class StatisticsSubset final :
                     public AbstractLabelWiseImmutableStatistics<StatisticVector, StatisticView, ScoreMatrix,
-                                                                RuleEvaluationFactory>::AbstractStatisticsSubset<T> {
+                                                                RuleEvaluationFactory>::template AbstractStatisticsSubset<T> {
 
                 private:
 
@@ -403,7 +403,7 @@ namespace boosting {
                                      std::unique_ptr<IRuleEvaluation<StatisticVector>> ruleEvaluationPtr,
                                      const T& labelIndices)
                         : AbstractLabelWiseImmutableStatistics<StatisticVector, StatisticView, ScoreMatrix,
-                                                               RuleEvaluationFactory>::AbstractStatisticsSubset<T>(
+                                                               RuleEvaluationFactory>::template AbstractStatisticsSubset<T>(
                               statistics, totalSumVector, std::move(ruleEvaluationPtr), labelIndices),
                           totalCoverableSumVector_(nullptr) {