Fix warnings from "make check".
diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index d4a13ae..79e05f1 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -221,7 +221,7 @@
    .. note::
 
       The `"%lld"` and `"%llu"` format specifiers are only available
-      when `HAVE_LONG_LONG` is defined.
+      when :const:`HAVE_LONG_LONG` is defined.
 
    .. versionchanged:: 2.7
       Support for `"%lld"` and `"%llu"` added.
diff --git a/Doc/c-api/string.rst b/Doc/c-api/string.rst
index 99fec5d..9b95859 100644
--- a/Doc/c-api/string.rst
+++ b/Doc/c-api/string.rst
@@ -138,7 +138,7 @@
    .. note::
 
       The `"%lld"` and `"%llu"` format specifiers are only available
-      when `HAVE_LONG_LONG` is defined.
+      when :const:`HAVE_LONG_LONG` is defined.
 
    .. versionchanged:: 2.7
       Support for `"%lld"` and `"%llu"` added.