diff --git a/src/Connection.jl b/src/Connection.jl
index dfe1aa3f89c107de97b72df76834d927626d2c08..ac29f69b45869c49e2c9baebad0572aa2e09cdc7 100644
--- a/src/Connection.jl
+++ b/src/Connection.jl
@@ -100,7 +100,7 @@ mutable struct _Configuration
 
     function _Configuration(managed_by_julia::Bool = false)
         config = new()
-        config._deletable(false)
+        config._deletable = false
         if managed_by_julia
             # Only append a finalizer for this if the object is
             # actually managed by Julia and not created and destroyed