diff --git a/phpBB/adm/style/install_header.html b/phpBB/adm/style/install_header.html
index 560bf501e9..99b98ef068 100644
--- a/phpBB/adm/style/install_header.html
+++ b/phpBB/adm/style/install_header.html
@@ -41,7 +41,7 @@ function dE(n, s, type)
 		<h1>{L_INSTALL_PANEL}</h1>
 		<p id="skip"><a href="#acp">{L_SKIP}</a></p>
 		<!-- IF S_LANG_SELECT -->
-		<form method="post" action="">
+		<form method="post" action="#">
 			<fieldset class="nobg">
 				<label for="language">{L_SELECT_LANG}{L_COLON}</label>
 				{S_LANG_SELECT}
diff --git a/phpBB/adm/style/install_update_diff.html b/phpBB/adm/style/install_update_diff.html
index c27304a425..150ef37e0e 100644
--- a/phpBB/adm/style/install_update_diff.html
+++ b/phpBB/adm/style/install_update_diff.html
@@ -223,7 +223,7 @@ table.hrdiff caption span {
 <!-- ENDIF -->
 <!-- IF not S_DIFF_NEW_FILE -->
 		<p id="skip"><a href="#acp">{L_SKIP}</a></p>
-		<form method="post" action="">
+		<form method="post" action="#">
 		<fieldset class="quick">
 			<label for="diff_mode">{L_SELECT_DIFF_MODE}{L_COLON}</label>
 			<select name="diff_mode" id="diff_mode">{S_DIFF_MODE_OPTIONS}</select>