diff --git a/lib/awful/tag.lua.in b/lib/awful/tag.lua.in
index 56fb8d686..0d753669d 100644
--- a/lib/awful/tag.lua.in
+++ b/lib/awful/tag.lua.in
@@ -345,7 +345,7 @@ end
 -- @param i The relative index to see.
 -- @param screen Optional screen number.
 function tag.viewidx(i, screen)
-    local screen = screen and screen.index or capi.mouse.screen
+    local screen = screen or capi.mouse.screen
     local tags = capi.screen[screen]:tags()
     local showntags = {}
     for k, t in ipairs(tags) do