diff --git a/ext/dom/config.m4 b/ext/dom/config.m4
index b71df7988c6..39d19acb339 100644
--- a/ext/dom/config.m4
+++ b/ext/dom/config.m4
@@ -28,14 +28,14 @@ if test -z "$PHP_ZLIB_DIR"; then
   [  --with-zlib-dir[=DIR]     DOM: Set the path to libz install prefix.], no, no)
 fi
 
-if test "$PHP_DOM5" != "no"; then
+if test "$PHP_DOM" != "no"; then
 
   DOM_DIR_ADD=""
-  if test -r $PHP_DOM5/include/libxml2/libxml/tree.h; then
-    DOM_DIR=$PHP_DOM5
+  if test -r $PHP_DOM/include/libxml2/libxml/tree.h; then
+    DOM_DIR=$PHP_DOM
     DOM_DIR_ADD="/libxml2"
-  elif test -r $PHP_DOM5/include/libxml/tree.h; then
-    DOM_DIR=$PHP_DOM5
+  elif test -r $PHP_DOM/include/libxml/tree.h; then
+    DOM_DIR=$PHP_DOM
   else
     for i in /usr/local /usr; do
       test -r $i/include/libxml/tree.h && DOM_DIR=$i