diff --git a/infer/src/backend/BuiltinDefn.ml b/infer/src/backend/BuiltinDefn.ml
index 9ebafef84..617e650b9 100644
--- a/infer/src/backend/BuiltinDefn.ml
+++ b/infer/src/backend/BuiltinDefn.ml
@@ -140,7 +140,7 @@ let execute___print_value { Builtin.tenv; pdesc; prop_; path; args; }
 let is_undefined_opt tenv prop n_lexp =
   let is_undef =
     Option.is_some (Attribute.get_undef tenv prop n_lexp) in
-  is_undef && (Config.angelic_execution || Config.optimistic_cast)
+  is_undef && Config.angelic_execution
 
 (** Creates an object in the heap with a given type, when the object is not known to be null or when
     it doesn't appear already in the heap. *)
diff --git a/infer/src/base/Config.ml b/infer/src/base/Config.ml
index eb3feb757..05616e2b2 100644
--- a/infer/src/base/Config.ml
+++ b/infer/src/base/Config.ml
@@ -940,10 +940,6 @@ and only_footprint =
   CLOpt.mk_bool ~deprecated:["only_footprint"] ~long:"only-footprint"
     "Skip the re-execution phase"
 
-and optimistic_cast =
-  CLOpt.mk_bool ~deprecated:["optimistic_cast"] ~long:"optimistic-cast"
-    "Allow cast of undefined values"
-
 and out_file =
   CLOpt.mk_path ~deprecated:["out_file"] ~long:"out-file" ~default:""
     ~meta:"file" "Specify the file for the non-error logs of the analyzer"
@@ -1451,7 +1447,6 @@ and nelseg = !nelseg
 and no_translate_libs = not !headers
 and objc_memory_model_on = !objc_memory_model
 and only_footprint = !only_footprint
-and optimistic_cast = !optimistic_cast
 and out_file_cmdline = !out_file
 and patterns_never_returning_null = match patterns_never_returning_null with (k,r) -> (k,!r)
 and patterns_skip_translation = match patterns_skip_translation with (k,r) -> (k,!r)
diff --git a/infer/src/base/Config.mli b/infer/src/base/Config.mli
index c27837724..f6a73470d 100644
--- a/infer/src/base/Config.mli
+++ b/infer/src/base/Config.mli
@@ -217,7 +217,6 @@ val nelseg : bool
 val no_translate_libs : bool
 val objc_memory_model_on : bool
 val only_footprint : bool
-val optimistic_cast : bool
 val out_file_cmdline : string
 val pmd_xml : bool
 val precondition_stats : bool