diff --git a/test/mocks/stats/mocks.h b/test/mocks/stats/mocks.h
index 190a61ed8d796..686ba38308d97 100644
--- a/test/mocks/stats/mocks.h
+++ b/test/mocks/stats/mocks.h
@@ -209,7 +209,7 @@ class MockHistogram : public MockMetric<Histogram> {
   uint32_t use_count() const override { return refcount_helper_.use_count(); }
 
   Unit unit_{Histogram::Unit::Unspecified};
-  Store* store_;
+  Store* store_{};
 
 private:
   RefcountHelper refcount_helper_;
@@ -237,7 +237,7 @@ class MockParentHistogram : public MockMetric<ParentHistogram> {
 
   bool used_;
   Unit unit_{Histogram::Unit::Unspecified};
-  Store* store_;
+  Store* store_{};
   std::shared_ptr<HistogramStatistics> histogram_stats_ =
       std::make_shared<HistogramStatisticsImpl>();