diff --git a/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
index ac8b3ebdf37..a1aeb918553 100644
--- a/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
+++ b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.cpp
@@ -739,7 +739,7 @@ size_t ShenandoahAdaptiveHeuristics::accelerated_consumption(double& acceleratio
       if (i > 0) {
         // first sample not included in weighted average because it has no weight.
         double sample_weight = x_array[i] - x_array[i-1];
-        weighted_y_sum = y_array[i] * sample_weight;
+        weighted_y_sum += y_array[i] * sample_weight;
         total_weight += sample_weight;
       }
       y_sum += y_array[i];
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp b/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp
index c39e2e7bb79..d765f33fee0 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahFreeSet.cpp
@@ -2848,7 +2848,7 @@ size_t ShenandoahFreeSet::reserve_regions(size_t to_reserve, size_t to_reserve_o
                               _partitions.leftmost(ShenandoahFreeSetPartitionId::OldCollector),
                               _partitions.rightmost(ShenandoahFreeSetPartitionId::OldCollector));
           old_region_count++;
-          assert(ac = ShenandoahHeapRegion::region_size_bytes(), "Cannot move to old unless entire region is in alloc capacity");
+          assert(ac == ShenandoahHeapRegion::region_size_bytes(), "Cannot move to old unless entire region is in alloc capacity");
           mutator_allocatable_words -= ShenandoahHeapRegion::region_size_words();
           continue;
         }