diff --git a/src/bin/expect_tests/contract_tests.ml b/src/bin/expect_tests/contract_tests.ml
index c2b26dc9a..cd835d61c 100644
--- a/src/bin/expect_tests/contract_tests.ml
+++ b/src/bin/expect_tests/contract_tests.ml
@@ -963,16 +963,6 @@ let%expect_test _ =
     * Open a gitlab issue: https://gitlab.com/ligolang/ligo/issues/new
     * Check the changelog by running 'ligo changelog' |}]
 
-let%expect_test _ =
-  run_ligo_good [ "run-function" ; contract "failwith.ligo" ; "failer" ; "1" ] ;
-  [%expect {|
-    failwith("some_string") |}]
-
-let%expect_test _ =
-  run_ligo_good [ "run-function" ; contract "failwith.ligo" ; "failer" ; "1" ; "--format=json" ] ;
-  [%expect {|
-    {"status":"ok","content":"failwith(\"some_string\")"} |}]
-
 let%expect_test _ =
   run_ligo_bad [ "compile-contract" ; contract "bad_address_format.religo" ; "main" ] ;
   [%expect {|
@@ -1084,7 +1074,7 @@ let%expect_test _ =
 let%expect_test _ =
   run_ligo_bad [ "compile-contract" ; bad_contract "create_contract_toplevel.mligo" ; "main" ] ;
   [%expect {|
-ligo: in file "create_contract_toplevel.mligo", line 4, character 35 to line 8, character 8. No free variable allowed in this lambda: variable 'store' {"expression":"CREATE_CONTRACT(lambda (#P:Some(( nat * string ))) : None return\n                let rhs#727 = #P in\n                let p = rhs#727.0 in\n                let s = rhs#727.1 in\n                ( LIST_EMPTY() : (type_operator: list(operation)) , store ) ,\n                NONE() : (type_operator: option(key_hash)) ,\n                300000000mutez ,\n                \"un\")","location":"in file \"create_contract_toplevel.mligo\", line 4, character 35 to line 8, character 8"}
+ligo: in file "create_contract_toplevel.mligo", line 4, character 35 to line 8, character 8. No free variable allowed in this lambda: variable 'store' {"expression":"CREATE_CONTRACT(lambda (#P:Some(( nat * string ))) : None return\n                let rhs#693 = #P in\n                let p = rhs#693.0 in\n                let s = rhs#693.1 in\n                ( LIST_EMPTY() : (type_operator: list(operation)) , store ) ,\n                NONE() : (type_operator: option(key_hash)) ,\n                300000000mutez ,\n                \"un\")","location":"in file \"create_contract_toplevel.mligo\", line 4, character 35 to line 8, character 8"}
 
 
  If you're not sure how to fix this error, you can
@@ -1097,7 +1087,7 @@ ligo: in file "create_contract_toplevel.mligo", line 4, character 35 to line 8,
 
   run_ligo_bad [ "compile-contract" ; bad_contract "create_contract_var.mligo" ; "main" ] ;
   [%expect {|
-ligo: in file "create_contract_var.mligo", line 6, character 35 to line 10, character 5. No free variable allowed in this lambda: variable 'a' {"expression":"CREATE_CONTRACT(lambda (#P:Some(( nat * int ))) : None return\n                let rhs#730 = #P in\n                let p = rhs#730.0 in\n                let s = rhs#730.1 in\n                ( LIST_EMPTY() : (type_operator: list(operation)) , a ) ,\n                NONE() : (type_operator: option(key_hash)) ,\n                300000000mutez ,\n                1)","location":"in file \"create_contract_var.mligo\", line 6, character 35 to line 10, character 5"}
+ligo: in file "create_contract_var.mligo", line 6, character 35 to line 10, character 5. No free variable allowed in this lambda: variable 'a' {"expression":"CREATE_CONTRACT(lambda (#P:Some(( nat * int ))) : None return\n                let rhs#696 = #P in\n                let p = rhs#696.0 in\n                let s = rhs#696.1 in\n                ( LIST_EMPTY() : (type_operator: list(operation)) , a ) ,\n                NONE() : (type_operator: option(key_hash)) ,\n                300000000mutez ,\n                1)","location":"in file \"create_contract_var.mligo\", line 6, character 35 to line 10, character 5"}
 
 
  If you're not sure how to fix this error, you can
diff --git a/src/bin/expect_tests/failwith_tests.ml b/src/bin/expect_tests/failwith_tests.ml
index a66d462ee..8c5819ca4 100644
--- a/src/bin/expect_tests/failwith_tests.ml
+++ b/src/bin/expect_tests/failwith_tests.ml
@@ -8,11 +8,11 @@ let bad_contract basename =
 let%expect_test _ =
   run_ligo_good [ "run-function" ; contract "failwith.ligo" ; "failer" ; "1" ] ;
   [%expect {|
-    failwith("some_string") |}];
+    failwith(42) |}];
 
   run_ligo_good [ "run-function" ; contract "failwith.ligo" ; "failer" ; "1" ; "--format=json" ] ;
   [%expect {|
-    {"status":"ok","content":"failwith(\"some_string\")"} |}];
+    {"status":"ok","content":"failwith(42)"} |}];
 
 
   run_ligo_good [ "dry-run" ; contract "subtle_nontail_fail.mligo" ; "main" ; "()" ; "()" ] ;
diff --git a/src/bin/expect_tests/typer_error_tests.ml b/src/bin/expect_tests/typer_error_tests.ml
index d37ac5dd5..3bb9f2651 100644
--- a/src/bin/expect_tests/typer_error_tests.ml
+++ b/src/bin/expect_tests/typer_error_tests.ml
@@ -189,4 +189,17 @@ let%expect_test _ =
     * Visit our documentation: https://ligolang.org/docs/intro/introduction
     * Ask a question on our Discord: https://discord.gg/9rhYaEt
     * Open a gitlab issue: https://gitlab.com/ligolang/ligo/issues/new
-    * Check the changelog by running 'ligo changelog' |}];
+    * Check the changelog by running 'ligo changelog' |}]
+
+let%expect_test _ =
+  run_ligo_bad [ "compile-contract" ; "../../test/contracts/negative/failwith_wrong_type.ligo" ; "main" ] ;
+  [%expect {|
+    ligo: in file "failwith_wrong_type.ligo", line 2, characters 19-46. Failwith with disallowed type: Expected arguments with one of the following combinations of types: failwith(string) or failwith(nat) or failwith(int) but got this combination instead: failwith((type_operator: list(int)))
+
+     If you're not sure how to fix this error, you can
+     do one of the following:
+
+    * Visit our documentation: https://ligolang.org/docs/intro/introduction
+    * Ask a question on our Discord: https://discord.gg/9rhYaEt
+    * Open a gitlab issue: https://gitlab.com/ligolang/ligo/issues/new
+    * Check the changelog by running 'ligo changelog' |}]
diff --git a/src/passes/operators/operators.ml b/src/passes/operators/operators.ml
index bd7cd3179..670f45c42 100644
--- a/src/passes/operators/operators.ml
+++ b/src/passes/operators/operators.ml
@@ -702,9 +702,21 @@ module Typer = struct
                    [i ; j ; s] ()
 
   let failwith_ = typer_1_opt "FAILWITH" @@ fun t opt ->
-    let%bind () =
-      Assert.assert_true @@
-      (is_t_string t) in
+    let%bind _ =
+      if eq_1 t (t_string ())
+      then ok ()
+      else if eq_1 t (t_nat ())
+      then ok ()
+      else if eq_1 t (t_int ())
+      then ok ()
+      else
+        fail @@ Operator_errors.typeclass_error "Failwith with disallowed type" "failwith"
+          [
+            [t_string()] ;
+            [t_nat()] ;
+            [t_int()] ;
+          ]
+          [t] () in
     let default = t_unit () in
     ok @@ Simple_utils.Option.unopt ~default opt
 
diff --git a/src/test/contracts/failwith.ligo b/src/test/contracts/failwith.ligo
index 73e9a4f06..48293b7e3 100644
--- a/src/test/contracts/failwith.ligo
+++ b/src/test/contracts/failwith.ligo
@@ -29,7 +29,7 @@ function foobar (const i : int) : int is
     }
     else
       case p of
-        Zero (n) -> failwith ("wooo")
+        Zero (n) -> failwith(42n)
       | Pos (n)  -> skip
       end
   } with
@@ -39,5 +39,5 @@ function foobar (const i : int) : int is
       end
 
 function failer (const p : int) : int is block {
-  if p = 1 then failwith ("some_string") else skip
+  if p = 1 then failwith (42) else skip
 } with p
diff --git a/src/test/contracts/negative/failwith_wrong_type.ligo b/src/test/contracts/negative/failwith_wrong_type.ligo
new file mode 100644
index 000000000..c5d6f7a68
--- /dev/null
+++ b/src/test/contracts/negative/failwith_wrong_type.ligo
@@ -0,0 +1,2 @@
+
+const bad : unit = failwith((nil : list(int)))