diff --git a/CMakeLists.txt b/CMakeLists.txt
index 335f3fa..29317fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
-project(libpressio VERSION "0.31.0" LANGUAGES CXX C)
+project(libpressio VERSION "0.31.1" LANGUAGES CXX C)
 
 #correct was to set a default build type
 # https://blog.kitware.com/cmake-and-the-default-build-type/
diff --git a/COPYRIGHT.txt b/COPYRIGHT.txt
index b1f6cf7..ea5761c 100644
--- a/COPYRIGHT.txt
+++ b/COPYRIGHT.txt
@@ -1,6 +1,6 @@
 Copyright © 2020 , UChicago Argonne, LLC
 All Rights Reserved
-[libpressio, Version 0.31.0]
+[libpressio, Version 0.31.1]
 Robert Underwood
 Argonne National Laboratory
 
diff --git a/include/libpressio_ext/cpp/dtype.h b/include/libpressio_ext/cpp/dtype.h
index 9004d28..f62ba01 100644
--- a/include/libpressio_ext/cpp/dtype.h
+++ b/include/libpressio_ext/cpp/dtype.h
@@ -1,3 +1,5 @@
+#ifndef LIBPRESSIO_DTYPE_CPP
+#define LIBPRESSIO_DTYPE_CPP
 #include <pressio_dtype.h>
 
 /**
@@ -22,3 +24,4 @@ constexpr pressio_dtype pressio_dtype_from_type() {
       );
 }
 
+#endif /* end of include guard: LIBPRESSIO_DTYPE_CPP */