diff --git a/ext/pdo_mysql/config.m4 b/ext/pdo_mysql/config.m4
index 5d35fea3800..a2864d081c8 100755
--- a/ext/pdo_mysql/config.m4
+++ b/ext/pdo_mysql/config.m4
@@ -60,6 +60,7 @@ Note that the MySQL client library is not bundled anymore.])
   fi
 
   PHP_NEW_EXTENSION(pdo_mysql, pdo_mysql.c mysql_driver.c mysql_statement.c, $ext_shared,,-I$pdo_inc_path)
+  PHP_ADD_EXTENSION_DEP(pdo_mysql, pdo)
   PDO_MYSQL_MODULE_TYPE=external
   PDO_MYSQL_INCLUDE=-I$MYSQL_INC_DIR
  
diff --git a/ext/pdo_pgsql/config.m4 b/ext/pdo_pgsql/config.m4
index 66b4949beaf..2ead970e9d4 100644
--- a/ext/pdo_pgsql/config.m4
+++ b/ext/pdo_pgsql/config.m4
@@ -98,4 +98,5 @@ dnl find PDO sources
   fi
 
   PHP_NEW_EXTENSION(pdo_pgsql, pdo_pgsql.c pgsql_driver.c pgsql_statement.c, $ext_shared,,-I$pdo_inc_path)
+  PHP_ADD_EXTENSION_DEP(pdo_pgsql, pdo) 
 fi