diff --git a/include/openmc/distribution.h b/include/openmc/distribution.h
index 28d9b9e810..e12a476ee2 100644
--- a/include/openmc/distribution.h
+++ b/include/openmc/distribution.h
@@ -21,7 +21,7 @@ namespace openmc {
 class Distribution {
 public:
   virtual ~Distribution() = default;
-  virtual double sample() const = 0;
+  virtual double sample(uint64_t * prn_seeds, int stream) const = 0;
 };
 
 //==============================================================================
diff --git a/include/openmc/random_lcg.h b/include/openmc/random_lcg.h
index 5f0fea4944..a0daf803c2 100644
--- a/include/openmc/random_lcg.h
+++ b/include/openmc/random_lcg.h
@@ -10,7 +10,7 @@ namespace openmc {
 // Module constants.
 //==============================================================================
 
-extern "C" const int N_STREAMS;
+constexpr int N_STREAMS = 6;
 extern "C" const int STREAM_TRACKING;
 extern "C" const int STREAM_TALLIES;
 extern "C" const int STREAM_SOURCE;