diff --git a/xmlreader.c b/xmlreader.c
index 6d6d558..ec36fe9 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -438,7 +438,7 @@
  *
  * Deallocate the memory used by an ID hash table.
  */
-void
+static void
 xmlTextReaderFreeIDTable(xmlIDTablePtr table) {
     xmlHashFree(table, (xmlHashDeallocator) xmlFreeID);
 }