diff --git a/awesomerc.lua.in b/awesomerc.lua.in
index 40e97d5d..99df8798 100644
--- a/awesomerc.lua.in
+++ b/awesomerc.lua.in
@@ -375,9 +375,9 @@ awful.hooks.manage.register(function (c, startup)
     -- Check if the application should be floating.
     local cls = c.class
     local inst = c.instance
-    if floatapps[cls] then
+    if floatapps[cls] ~= nil then
         awful.client.floating.set(c, floatapps[cls])
-    elseif floatapps[inst] then
+    elseif floatapps[inst] ~= nil then
         awful.client.floating.set(c, floatapps[inst])
     end