diff --git a/dtool/Config.pp b/dtool/Config.pp
index beeb99a667..ec62882d34 100644
--- a/dtool/Config.pp
+++ b/dtool/Config.pp
@@ -102,6 +102,10 @@
 
 // #define INSTALL_LIB_DIR /usr/lib/python2.2/site-packages
 
+// If you  want to use python 2.2 or earlier, you may need this defined:
+// (Later versions of Python handle signed and unsigned integers differently).
+// #define USE_PYTHON_2_2_OR_EARLIER
+
 
 // The character used to separate components of an OS-specific
 // directory name depends on the platform (it is '/' on Unix, '\' on
diff --git a/dtool/LocalSetup.pp b/dtool/LocalSetup.pp
index 9a1192ccba..a997209921 100644
--- a/dtool/LocalSetup.pp
+++ b/dtool/LocalSetup.pp
@@ -449,6 +449,6 @@ $[cdefine MODERN_STYLE_ALLOCATOR]
 $[cdefine NO_STYLE_ALLOCATOR]
 
 /* Define if you want to use Python before 2.3.  */
-$[cdefine USING_PYTHON_2_2_OR_EARLIER]
+$[cdefine USE_PYTHON_2_2_OR_EARLIER]
 
 #end dtool_config.h