diff --git a/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp b/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp
index 5b7a247063..06ed7efc03 100644
--- a/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp
+++ b/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp
@@ -1169,7 +1169,7 @@ int Mdrunner::mdrunner()
     }
 
     // The GPU update is decided here because we need to know whether the constraints or
-    // SETTLEs can span across the domain borders (i.e. whether or not update groups are
+    // SETTLEs can span accross the domain borders (i.e. whether or not update groups are
     // defined). This is only known after DD is initialized, hence decision on using GPU
     // update is done so late.
     try
@@ -1591,6 +1591,7 @@ int Mdrunner::mdrunner()
 
         /* PLUMED */
         if(plumedswitch){
+          if(useModularSimulator) gmx_fatal(FARGS, "PLUMED is not yet compatible with GROMACS new modular simulator");
           /* detect plumed API version */
           int pversion=0;
           plumed_cmd(plumedmain,"getApiVersion",&pversion);
diff --git a/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp.preplumed b/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp.preplumed
index 5a52ddfb90..3c9def3eaa 100644
--- a/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp.preplumed
+++ b/patches/gromacs-2020.4.diff/src/gromacs/mdrun/runner.cpp.preplumed
@@ -1159,7 +1159,7 @@ int Mdrunner::mdrunner()
     }
 
     // The GPU update is decided here because we need to know whether the constraints or
-    // SETTLEs can span across the domain borders (i.e. whether or not update groups are
+    // SETTLEs can span accross the domain borders (i.e. whether or not update groups are
     // defined). This is only known after DD is initialized, hence decision on using GPU
     // update is done so late.
     try