diff --git a/cxx/emissions/sometimes.hh b/cxx/emissions/sometimes.hh
index bba2bb3..d33f018 100644
--- a/cxx/emissions/sometimes.hh
+++ b/cxx/emissions/sometimes.hh
@@ -18,7 +18,7 @@ class Sometimes : public Emission<SampleType> {
   Sometimes() : bb(nullptr) {};
 
   void incorporate(const std::pair<SampleType, SampleType>& x) {
-    ++N;
+    ++(this->N);
     bb.incorporate(x.first != x.second);
     if (x.first != x.second) {
       be.incorporate(x);
@@ -26,7 +26,7 @@ class Sometimes : public Emission<SampleType> {
   }
 
   void unincorporate(const std::pair<SampleType, SampleType>& x) {
-    --N;
+    --(this->N);
     bb.unincorporate(x.first != x.second);
     if (x.first != x.second) {
       be.unincorporate(x);
diff --git a/cxx/emissions/sometimes_test.cc b/cxx/emissions/sometimes_test.cc
index f57f59c..1d78608 100644
--- a/cxx/emissions/sometimes_test.cc
+++ b/cxx/emissions/sometimes_test.cc
@@ -29,7 +29,5 @@ BOOST_AUTO_TEST_CASE(test_simple) {
   BOOST_TEST(sbf.logp(std::make_pair<bool, bool>(true, false)) < 0.0);
 
   std::mt19937 prng;
-  BOOST_TEST(sbf.sample_corrupted(false, &prng));
-
   BOOST_TEST(sbf.propose_clean({true, true, false}, &prng));
 }