diff --git a/glean/rocksdb/database-impl.cpp b/glean/rocksdb/database-impl.cpp
index 61c4aae48..fb91b604e 100644
--- a/glean/rocksdb/database-impl.cpp
+++ b/glean/rocksdb/database-impl.cpp
@@ -269,7 +269,8 @@ struct SeekIterator final : rts::FactIterator {
   Fact::Ref get(Demand demand) override {
     if (iter_->Valid()) {
       auto key = input(iter_->key());
-      assert(key.fixed<Pid>() == type_);
+      auto ty = key.fixed<Pid>();
+      assert(ty == type_);
       auto value = input(iter_->value());
       auto id = value.fixed<Id>();
       assert(value.empty());
@@ -277,7 +278,7 @@ struct SeekIterator final : rts::FactIterator {
       if (demand == KeyOnly) {
         return Fact::Ref{id, type_, Fact::Clause::fromKey(key.bytes())};
       } else {
-        [[maybe_unused]] auto found = db_->lookupById(id, slice_);
+        auto found = db_->lookupById(id, slice_);
         assert(found);
         return decomposeFact(id, slice_);
       }
diff --git a/glean/rts/stacked.h b/glean/rts/stacked.h
index 13aa95a7f..0c36f512c 100644
--- a/glean/rts/stacked.h
+++ b/glean/rts/stacked.h
@@ -160,11 +160,12 @@ struct Stacked<Define> final : StackedBase<Define> {
         //       similar). This means that there is no need to check against the
         //       value stored in the database as that must be empty, too.
         if (clause.value_size != 0) {
-          assert(base->factById(id, [&](auto, auto found) {
+          bool found = base->factById(id, [&](auto, auto found) {
             if (clause.value() != found.value()) {
               id = Id::invalid();
             }
-          }));
+          });
+          assert(found);
         }
         return id;
       }