diff --git a/Python/errors.c b/Python/errors.c
index 15e6ba0..98910b4 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -947,7 +947,7 @@
     _Py_IDENTIFIER(__module__);
     PyObject *f, *t, *v, *tb;
     PyObject *moduleName = NULL;
-    char* className;
+    const char *className;
 
     PyErr_Fetch(&t, &v, &tb);
 
@@ -977,7 +977,7 @@
     assert(PyExceptionClass_Check(t));
     className = PyExceptionClass_Name(t);
     if (className != NULL) {
-        char *dot = strrchr(className, '.');
+        const char *dot = strrchr(className, '.');
         if (dot != NULL)
             className = dot+1;
     }
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 26f74c8..3d40c79 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -774,12 +774,12 @@
     }
     else {
         PyObject* moduleName;
-        char* className;
+        const char *className;
         _Py_IDENTIFIER(__module__);
         assert(PyExceptionClass_Check(type));
         className = PyExceptionClass_Name(type);
         if (className != NULL) {
-            char *dot = strrchr(className, '.');
+            const char *dot = strrchr(className, '.');
             if (dot != NULL)
                 className = dot+1;
         }