diff --git a/CHANGES/v2.3.txt b/CHANGES/v2.3.txt
index 6291296c0922be83ae224e65aa522c05832c76a3..62f299cd51e3f0aad393603b789bbad8ecb81bbd 100644
--- a/CHANGES/v2.3.txt
+++ b/CHANGES/v2.3.txt
@@ -126,6 +126,7 @@ Fixes since 2.3b. Relevant things could be merged in the changelog above when we
 - \ref PUCKERING now supports 6 membered rings.
 - Tutorials have been (partially) updated to reflect some of the changes in the syntax
 - gromacs 5.1.x patch updated to 5.1.4
+- When using \ref METAD with file-based multple walkers and parallel jobs (i.e. mpirun) extra suffix is not added (thanks to Marco De La Pierre).
 - (for developers) A script is available to check if source code complies plumed standard. Notice that this script is run together with cppcheck on travis-ci.
 - (for developers) Cppcheck on travis-ci has been updated to 1.75. Several small issues triggering errors on 1.75 were fixed (e.g. structures passed by value
    are now passed by const ref) and false positives marked as such.
diff --git a/src/bias/MetaD.cpp b/src/bias/MetaD.cpp
index 57913f98387b48c447b403847cef2a441a05b80e..71ac9e01cc6661a63fbcdc80797632eae41c63f7 100644
--- a/src/bias/MetaD.cpp
+++ b/src/bias/MetaD.cpp
@@ -887,6 +887,7 @@ last_step_warn_grid(0)
     if(r>0) ifilesnames[mw_id_]="/dev/null";
     hillsOfile_.enforceSuffix("");
   }
+  if(mw_n_>1) hillsOfile_.enforceSuffix("");
   hillsOfile_.open(ifilesnames[mw_id_]);
   if(fmt.length()>0) hillsOfile_.fmtField(fmt);
   hillsOfile_.addConstantField("multivariate");