diff --git a/src/rmn.cpp b/src/rmn.cpp
index 03e32f1..cd266a4 100644
--- a/src/rmn.cpp
+++ b/src/rmn.cpp
@@ -42,7 +42,7 @@ void estimateZ(
   arma::vec& empty,
   double& lnL
 ){
-  arma::uword L = lnEmPN.size();
+  arma::uword L = z.size();
   std::vector<double> F(L + 1);
   std::vector<double> B(L + 1);
   std::vector<double>::iterator F_it = F.begin();