diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index b0c2fc707..d7bc22fd5 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -2275,7 +2275,7 @@ StScrollBar StButton#vhandle:active {
 /* Magnifier */
 
 .magnifier-zoom-region {
-    border: 2px solid rgba(128, 0, 0, 255);
+    border: 2px solid rgba(128, 0, 0, 1);
 }
 
 .magnifier-zoom-region.full-screen {