diff --git a/imports/callback/client.lua b/imports/callback/client.lua
index 0e61f85..3f0d52b 100644
--- a/imports/callback/client.lua
+++ b/imports/callback/client.lua
@@ -74,6 +74,10 @@ lib.callback = setmetatable({}, {
         else
             local cbType = type(cb)
 
+            if cbType == 'table' and getmetatable(cb)?.__call then
+                cbType = 'function'
+            end
+
             assert(cbType == 'function', ("expected argument 3 to have type 'function' (received %s)"):format(cbType))
         end
 
diff --git a/imports/callback/server.lua b/imports/callback/server.lua
index 5309a4a..127c3bf 100644
--- a/imports/callback/server.lua
+++ b/imports/callback/server.lua
@@ -57,6 +57,10 @@ lib.callback = setmetatable({}, {
         else
             local cbType = type(cb)
 
+            if cbType == 'table' and getmetatable(cb)?.__call then
+                cbType = 'function'
+            end
+
             assert(cbType == 'function', ("expected argument 3 to have type 'function' (received %s)"):format(cbType))
         end