diff --git a/src/USER-LB/fix_lb_fluid.cpp b/src/USER-LB/fix_lb_fluid.cpp
index 6f1dfc9982..9e6b9c72f1 100644
--- a/src/USER-LB/fix_lb_fluid.cpp
+++ b/src/USER-LB/fix_lb_fluid.cpp
@@ -547,6 +547,18 @@ FixLbFluid::~FixLbFluid()
   } else {
     delete [] NodeArea;
   }
+  MPI_Type_free(&passxf);
+  MPI_Type_free(&passyf);
+  MPI_Type_free(&passzf);
+  MPI_Type_free(&passxu);
+  MPI_Type_free(&passyu);
+  MPI_Type_free(&passzf);
+  MPI_Type_free(&passxrho);
+  MPI_Type_free(&passyrho);
+  MPI_Type_free(&passzrho);
+  MPI_Type_free(&passxtemp);
+  MPI_Type_free(&passytemp);
+  MPI_Type_free(&passztemp);
 }
 
 int FixLbFluid::setmask()