diff --git a/sapi/apache/config.m4 b/sapi/apache/config.m4
index ca23a1d49e8..540c6fc3437 100644
--- a/sapi/apache/config.m4
+++ b/sapi/apache/config.m4
@@ -34,6 +34,7 @@ AC_ARG_WITH(apxs,
   APXS_INCLUDEDIR=`$APXS -q INCLUDEDIR`
   APXS_CFLAGS=`$APXS -q CFLAGS`
   APXS_HTTPD=`$APXS -q SBINDIR`/`$APXS -q TARGET`
+  APACHE_INCLUDE=-I$APXS_INCLUDEDIR
 
   # Test that we're trying to configure with apache 1.x
   PHP_AP_EXTRACT_VERSION($APXS_HTTPD)