--- a/src/parallel.cc
+++ b/src/parallel.cc
@@ -35,6 +35,10 @@
 using std::pair;
 using std::vector;
 using std::list;
+
+using jags::RNG;
+using jags::RNGFactory;
+using jags::Model;
 
 #include <R.h>
 #include <Rinternals.h>