4 files changed, 4 insertions, 3 deletions
diff --git a/phpBB/adm/style/install_header.html b/phpBB/adm/style/install_header.html
index c818a4fc6d..6f7f129d39 100644
--- a/phpBB/adm/style/install_header.html
+++ b/phpBB/adm/style/install_header.html
@@ -2,7 +2,7 @@
 <html dir="{S_CONTENT_DIRECTION}" lang="{S_USER_LANG}">
 <head>
 <meta charset="utf-8">
-<meta name="viewport" content="width=device-width" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
 <!-- IF META -->{META}<!-- ENDIF -->
 <title>{PAGE_TITLE}</title>
 
diff --git a/phpBB/adm/style/install_update_diff.html b/phpBB/adm/style/install_update_diff.html
index 150ef37e0e..5f80084705 100644
--- a/phpBB/adm/style/install_update_diff.html
+++ b/phpBB/adm/style/install_update_diff.html
@@ -2,7 +2,7 @@
 <html dir="{S_CONTENT_DIRECTION}" lang="{S_USER_LANG}">
 <head>
 <meta charset="utf-8">
-<meta name="viewport" content="width=device-width" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
 <!-- IF META -->{META}<!-- ENDIF -->
 <title>{PAGE_TITLE}</title>
 
diff --git a/phpBB/adm/style/overall_header.html b/phpBB/adm/style/overall_header.html
index f1f7eee282..ada88edff2 100644
--- a/phpBB/adm/style/overall_header.html
+++ b/phpBB/adm/style/overall_header.html
@@ -2,7 +2,7 @@
 <html dir="{S_CONTENT_DIRECTION}" lang="{S_USER_LANG}">
 <head>
 <meta charset="utf-8">
-<meta name="viewport" content="width=device-width" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
 <!-- IF META -->{META}<!-- ENDIF -->
 <title>{PAGE_TITLE}</title>
 
diff --git a/phpBB/adm/style/simple_header.html b/phpBB/adm/style/simple_header.html
index d0b9bf62ed..f62a7a900e 100644
--- a/phpBB/adm/style/simple_header.html
+++ b/phpBB/adm/style/simple_header.html
@@ -2,6 +2,7 @@
 <html dir="{S_CONTENT_DIRECTION}" lang="{S_USER_LANG}">
 <head>
 <meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1" />
 <!-- IF META -->{META}<!-- ENDIF -->
 <title>{PAGE_TITLE}</title>