diff --git a/src/USER-BOCS/fix_bocs.cpp b/src/USER-BOCS/fix_bocs.cpp
index 0dad793fd2..d9715362c1 100644
--- a/src/USER-BOCS/fix_bocs.cpp
+++ b/src/USER-BOCS/fix_bocs.cpp
@@ -64,11 +64,6 @@ enum{ISO,ANISO,TRICLINIC};
 
 const int NUM_INPUT_DATA_COLUMNS = 2;     // columns in the pressure correction file
 
-// NB:
-// - Keep error and warning messages less than 255 chars long.
-// - Allocate your char buffer to be 1 char longer than this
-const int MAX_MESSAGE_LENGTH = 255;
-
 /* ----------------------------------------------------------------------
    NVT,NPH,NPT integrators for improved Nose-Hoover equations of motion
  ---------------------------------------------------------------------- */
diff --git a/src/math_eigen_impl.h b/src/math_eigen_impl.h
index 5f7dc0a255..a48158de32 100644
--- a/src/math_eigen_impl.h
+++ b/src/math_eigen_impl.h
@@ -1353,7 +1353,7 @@ PrincipalEigen(ConstMatrix matrix,
   Scalar eval;
 
   // This line does all of the hard work:
-  size_t itern = ll_engine.run(eval, evec);
+  ll_engine.run(eval, evec);
 
   for (int i = 0; i < n; i++)
     eigenvector[i] = evec[i];
diff --git a/src/molecule.cpp b/src/molecule.cpp
index 3f8498cbe0..f120a964e3 100644
--- a/src/molecule.cpp
+++ b/src/molecule.cpp
@@ -802,7 +802,7 @@ void Molecule::charges(char *line)
       readline(line);
 
       ValueTokenizer values(line);
-      if (values.count() != 2) error->one(FLERR,"Invalid Charges section in molecule file");
+      if ((int)values.count() != 2) error->one(FLERR,"Invalid Charges section in molecule file");
 
       values.next_int();
       q[i] = values.next_double();