diff --git a/theme/bootstrapbase/layout/columns2.php b/theme/bootstrapbase/layout/columns2.php
index a4ecdd46297..3de682c2f9e 100644
--- a/theme/bootstrapbase/layout/columns2.php
+++ b/theme/bootstrapbase/layout/columns2.php
@@ -27,7 +27,7 @@ $regionmain = 'span9 pull-right';
 $sidepre = 'span3 desktop-first-column';
 // Reset layout mark-up for RTL languages.
 if (right_to_left()) {
-    $regionmain = 'span9';
+    $regionmain = 'span9 desktop-first-column';
     $sidepre = 'span3 pull-right';
 }
 
diff --git a/theme/bootstrapbase/layout/columns3.php b/theme/bootstrapbase/layout/columns3.php
index 7d7341a9e79..cdb4c688298 100644
--- a/theme/bootstrapbase/layout/columns3.php
+++ b/theme/bootstrapbase/layout/columns3.php
@@ -23,7 +23,7 @@
  */
 
 // Set default (LTR) layout mark-up for a three column page.
-$regionmainbox = 'span9';
+$regionmainbox = 'span9 desktop-first-column';
 $regionmain = 'span8 pull-right';
 $sidepre = 'span4 desktop-first-column';
 $sidepost = 'span3 pull-right';
diff --git a/theme/bootstrapbase/layout/secure.php b/theme/bootstrapbase/layout/secure.php
index d4399e3945a..fd4993da690 100644
--- a/theme/bootstrapbase/layout/secure.php
+++ b/theme/bootstrapbase/layout/secure.php
@@ -23,7 +23,7 @@
  */
 
 // Set default (LTR) layout mark-up for a three column page.
-$regionmainbox = 'span9';
+$regionmainbox = 'span9 desktop-first-column';
 $regionmain = 'span8 pull-right';
 $sidepre = 'span4 desktop-first-column';
 $sidepost = 'span3 pull-right';
diff --git a/theme/clean/layout/columns2.php b/theme/clean/layout/columns2.php
index 7f57fcb54ee..5f35cc61f86 100644
--- a/theme/clean/layout/columns2.php
+++ b/theme/clean/layout/columns2.php
@@ -30,7 +30,7 @@ $regionmain = 'span9 pull-right';
 $sidepre = 'span3 desktop-first-column';
 // Reset layout mark-up for RTL languages.
 if (right_to_left()) {
-    $regionmain = 'span9';
+    $regionmain = 'span9 desktop-first-column';
     $sidepre = 'span3 pull-right';
 }
 
diff --git a/theme/clean/layout/columns3.php b/theme/clean/layout/columns3.php
index 0b0379408d0..7167cfb06e8 100644
--- a/theme/clean/layout/columns3.php
+++ b/theme/clean/layout/columns3.php
@@ -32,7 +32,7 @@
 $html = theme_clean_get_html_for_settings($OUTPUT, $PAGE);
 
 // Set default (LTR) layout mark-up for a three column page.
-$regionmainbox = 'span9';
+$regionmainbox = 'span9 desktop-first-column';
 $regionmain = 'span8 pull-right';
 $sidepre = 'span4 desktop-first-column';
 $sidepost = 'span3 pull-right';
diff --git a/theme/clean/layout/secure.php b/theme/clean/layout/secure.php
index 5113ae76ef8..e12a3484d75 100644
--- a/theme/clean/layout/secure.php
+++ b/theme/clean/layout/secure.php
@@ -26,7 +26,7 @@
 $html = theme_clean_get_html_for_settings($OUTPUT, $PAGE);
 
 // Set default (LTR) layout mark-up for a three column page.
-$regionmainbox = 'span9';
+$regionmainbox = 'span9 desktop-first-column';
 $regionmain = 'span8 pull-right';
 $sidepre = 'span4 desktop-first-column';
 $sidepost = 'span3 pull-right';