--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -12,17 +12,17 @@
 
 %include ../shared/browser.inc
 %include linuxShared.inc
 
 %include ../shared/browser.inc.css
 
 :root {
 %ifdef MOZ_PHOTON_THEME
-  --toolbarbutton-border-radius: 2px;
+  --toolbarbutton-border-radius: 4px;
 %else
   --toolbarbutton-border-radius: 1px;
 
   --backbutton-background: rgba(255,255,255,.15);
   --backbutton-border-color: var(--urlbar-border-color-hover);
 
   --toolbarbutton-hover-background: rgba(255,255,255,.5) linear-gradient(rgba(255,255,255,.5), transparent);
   --toolbarbutton-hover-bordercolor: rgba(0,0,0,.25);