diff --git a/expat/xmlparse/hashtable.h b/expat/xmlparse/hashtable.h
index d10e591c7ff8..63478a0812c7 100644
--- a/expat/xmlparse/hashtable.h
+++ b/expat/xmlparse/hashtable.h
@@ -22,8 +22,12 @@ Contributor(s):
 #include <stddef.h>
 
 #ifdef XML_UNICODE
+#ifdef XML_UNICODE_WCHAR_T
 typedef const wchar_t *KEY;
 #else
+typedef const unsigned short *KEY;
+#endif
+#else
 typedef const char *KEY;
 #endif
 
diff --git a/parser/expat/lib/hashtable.h b/parser/expat/lib/hashtable.h
index d10e591c7ff8..63478a0812c7 100644
--- a/parser/expat/lib/hashtable.h
+++ b/parser/expat/lib/hashtable.h
@@ -22,8 +22,12 @@ Contributor(s):
 #include <stddef.h>
 
 #ifdef XML_UNICODE
+#ifdef XML_UNICODE_WCHAR_T
 typedef const wchar_t *KEY;
 #else
+typedef const unsigned short *KEY;
+#endif
+#else
 typedef const char *KEY;
 #endif