diff --git a/main/xml.c b/main/xml.c
index d920b1d566..9a0c66d900 100644
--- a/main/xml.c
+++ b/main/xml.c
@@ -27,7 +27,6 @@
 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
 #if defined(HAVE_LIBXML2)
-#define _POSIX_C_SOURCE	200112L
 #include <libxml/parser.h>
 #include <libxml/tree.h>
 /* libxml2 ast_xml implementation. */