diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index 58ffd23..23d0e2d 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -1937,6 +1937,23 @@
     MYCONST(XML_ERROR_UNCLOSED_CDATA_SECTION);
     MYCONST(XML_ERROR_EXTERNAL_ENTITY_HANDLING);
     MYCONST(XML_ERROR_NOT_STANDALONE);
+    MYCONST(XML_ERROR_UNEXPECTED_STATE);
+    MYCONST(XML_ERROR_ENTITY_DECLARED_IN_PE);
+    MYCONST(XML_ERROR_FEATURE_REQUIRES_XML_DTD);
+    MYCONST(XML_ERROR_CANT_CHANGE_FEATURE_ONCE_PARSING);
+    /* Added in Expat 1.95.7. */
+    MYCONST(XML_ERROR_UNBOUND_PREFIX);
+    /* Added in Expat 1.95.8. */
+    MYCONST(XML_ERROR_UNDECLARING_PREFIX);
+    MYCONST(XML_ERROR_INCOMPLETE_PE);
+    MYCONST(XML_ERROR_XML_DECL);
+    MYCONST(XML_ERROR_TEXT_DECL);
+    MYCONST(XML_ERROR_PUBLICID);
+    MYCONST(XML_ERROR_SUSPENDED);
+    MYCONST(XML_ERROR_NOT_SUSPENDED);
+    MYCONST(XML_ERROR_ABORTED);
+    MYCONST(XML_ERROR_FINISHED);
+    MYCONST(XML_ERROR_SUSPEND_PE);
 
     PyModule_AddStringConstant(errors_module, "__doc__",
                                "Constants used to describe error conditions.");