diff --git a/src/hotspot/share/gc/g1/g1SurvRateGroup.cpp b/src/hotspot/share/gc/g1/g1SurvRateGroup.cpp
index c5c0ca992b078..d5fd50c4523cd 100644
--- a/src/hotspot/share/gc/g1/g1SurvRateGroup.cpp
+++ b/src/hotspot/share/gc/g1/g1SurvRateGroup.cpp
@@ -46,7 +46,7 @@ void G1SurvRateGroup::reset() {
   // The call to stop_adding_regions() will use "new" to refill
   // the _surv_rate_pred array, so we need to make sure to call
   // "delete".
-  for (size_t i = 0; i < _stats_arrays_length; ++i) {
+  for (uint i = 0; i < _stats_arrays_length; ++i) {
     delete _surv_rate_predictors[i];
   }
   _stats_arrays_length = 0;
@@ -76,7 +76,7 @@ void G1SurvRateGroup::stop_adding_regions() {
                     ? _accum_surv_rate_pred[_stats_arrays_length - 1] - _accum_surv_rate_pred[_stats_arrays_length - 2]
                     : InitialSurvivorRate;
 
-    for (size_t i = _stats_arrays_length; i < _num_added_regions; ++i) {
+    for (uint i = _stats_arrays_length; i < _num_added_regions; ++i) {
       // Initialize predictors and accumulated survivor rate predictions.
       _surv_rate_predictors[i] = new TruncatedSeq(10);
       if (i == 0) {
@@ -123,7 +123,7 @@ double G1SurvRateGroup::accum_surv_rate_pred(uint age) const {
 void G1SurvRateGroup::fill_in_last_surv_rates() {
   if (_num_added_regions > 0) { // conservative
     double surv_rate = _surv_rate_predictors[_num_added_regions-1]->last();
-    for (size_t i = _num_added_regions; i < _stats_arrays_length; ++i) {
+    for (uint i = _num_added_regions; i < _stats_arrays_length; ++i) {
       _surv_rate_predictors[i]->add(surv_rate);
     }
   }
@@ -132,7 +132,7 @@ void G1SurvRateGroup::fill_in_last_surv_rates() {
 void G1SurvRateGroup::finalize_predictions(const G1Predictions& predictor) {
   double accum = 0.0;
   double pred = 0.0;
-  for (size_t i = 0; i < _stats_arrays_length; ++i) {
+  for (uint i = 0; i < _stats_arrays_length; ++i) {
     pred = predictor.predict_in_unit_interval(_surv_rate_predictors[i]);
     accum += pred;
     _accum_surv_rate_pred[i] = accum;