diff --git a/src/libs/common/config_os.h b/src/libs/common/config_os.h
index 2b1d663a..a832d243 100644
--- a/src/libs/common/config_os.h
+++ b/src/libs/common/config_os.h
@@ -2,7 +2,7 @@
 #define CONFIG_OS_H_
 
 
-#define PESTPP_VERSION "5.2.15";
+#define PESTPP_VERSION "5.2.16";
 
 #if defined(_WIN32) || defined(_WIN64)
 #define OS_WIN
diff --git a/src/libs/pestpp_common/EnsembleMethodUtils.cpp b/src/libs/pestpp_common/EnsembleMethodUtils.cpp
index 9756f1bf..003ef593 100644
--- a/src/libs/pestpp_common/EnsembleMethodUtils.cpp
+++ b/src/libs/pestpp_common/EnsembleMethodUtils.cpp
@@ -7750,7 +7750,7 @@ void EnsembleMethod::reset_par_ensemble_to_prior_mean(){
     ss << "iteration:" << iter;
     vector<int> temp;
     ofstream& frec = file_manager.rec_ofstream();
-    oe = oe_base;
+    oe.reserve(oe_base.get_real_names(),oe.get_var_names());
     weights = weights_base;
     run_ensemble_util(performance_log,frec,new_pe,oe,run_mgr_ptr,false,temp,NetPackage::NULL_DA_CYCLE, ss.str());
     pe = new_pe;