diff --git a/src/PLUMED/fix_plumed.cpp b/src/PLUMED/fix_plumed.cpp
index 137cd580a8..dcf82a4374 100644
--- a/src/PLUMED/fix_plumed.cpp
+++ b/src/PLUMED/fix_plumed.cpp
@@ -77,9 +77,9 @@ FixPlumed::FixPlumed(LAMMPS *lmp, int narg, char **arg) :
 
   int api_version=0;
   p->cmd("getApiVersion",&api_version);
-  if ((api_version < 5) || (api_version > 8))
+  if ((api_version < 5) || (api_version > 9))
     error->all(FLERR,"Incompatible API version for PLUMED in fix plumed. "
-               "Only Plumed 2.4.x, 2.5.x, 2.6.x, 2.7.x are tested and supported.");
+               "Only Plumed 2.4.x, 2.5.x, 2.6.x, 2.7.x, 2.8.x are tested and supported.");
 
 #if !defined(MPI_STUBS)
   // If the -partition option is activated then enable