diff --git a/ext/filter/config.m4 b/ext/filter/config.m4
index b7934701bb612..7a5a4b682e948 100644
--- a/ext/filter/config.m4
+++ b/ext/filter/config.m4
@@ -6,7 +6,6 @@ PHP_ARG_ENABLE([filter],
 
 if test "$PHP_FILTER" != "no"; then
   PHP_NEW_EXTENSION(filter, filter.c sanitizing_filters.c logical_filters.c callback_filter.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
-  PHP_SUBST(FILTER_SHARED_LIBADD)
 
   PHP_INSTALL_HEADERS([ext/filter], [php_filter.h])
   PHP_ADD_EXTENSION_DEP(filter, pcre)
diff --git a/ext/mysqli/config.m4 b/ext/mysqli/config.m4
index ab060ebc4f15f..d8f40ba479d8d 100644
--- a/ext/mysqli/config.m4
+++ b/ext/mysqli/config.m4
@@ -64,7 +64,6 @@ if test "$PHP_MYSQLI" != "no"; then
                   mysqli_report.c mysqli_driver.c mysqli_warning.c \
                   mysqli_exception.c mysqli_result_iterator.c"
   PHP_NEW_EXTENSION(mysqli, $mysqli_sources, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
-  PHP_SUBST(MYSQLI_SHARED_LIBADD)
   PHP_INSTALL_HEADERS([ext/mysqli], [php_mysqli_structs.h mysqli_mysqlnd.h])
   PHP_ADD_EXTENSION_DEP(mysqli, mysqlnd)
 fi