diff --git a/nix/overlays/haskell-packages.nix b/nix/overlays/haskell-packages.nix
index 5acb8821..311d8f39 100644
--- a/nix/overlays/haskell-packages.nix
+++ b/nix/overlays/haskell-packages.nix
@@ -308,8 +308,8 @@ in {
               source = pkgsNew.fetchFromGitHub {
                 owner = "awakesecurity";
                 repo = "proto3-wire";
-                rev = "6fcef0427abf4f02ec28fd041bd27c647234655b"; # 1.4.4
-                sha256 = "5IoaqARYdrxkmk0r0Z0J/OaVKIH1ehyWKllCrHVvslc=";
+                rev = "40a907da45cf3946d91ac34799749b6e92cc86d2"; # 1.4.4
+                sha256 = "8LgeDChLOpcLiBX/tRBmhan2o/TWBSdompfPoqBI7NQ=";
               };
             in
               pkgsNew.haskell.lib.doJailbreak
diff --git a/proto3-suite.cabal b/proto3-suite.cabal
index 55c7a7f3..43ecea75 100644
--- a/proto3-suite.cabal
+++ b/proto3-suite.cabal
@@ -175,22 +175,24 @@ test-suite tests
   autogen-modules:
     TestProto
     TestProtoImport
+    TestProtoNegativeEnum
+    TestProtoNestedMessage
     TestProtoOneof
     TestProtoOneofImport
     TestProtoWrappers
-    TestProtoNestedMessage
 
   other-modules:
     ArbitraryGeneratedTestTypes
     TestCodeGen
     TestProto
     TestProtoImport
-    TestProtoOneof
-    TestProtoOneofImport
-    TestProtoWrappers
     --TestProtoLeadingDot
+    TestProtoNegativeEnum
     TestProtoNestedMessage
+    TestProtoOneof
+    TestProtoOneofImport
     --TestProtoProtocPlugin
+    TestProtoWrappers
     Test.Proto.Generate.Name
     Test.Proto.Generate.Name.Gen
     Test.Proto.Parse
diff --git a/tests/SimpleEncodeDotProto.hs b/tests/SimpleEncodeDotProto.hs
index e8267bcf..c8b4c1b8 100644
--- a/tests/SimpleEncodeDotProto.hs
+++ b/tests/SimpleEncodeDotProto.hs
@@ -322,7 +322,7 @@ testCase_BytesValue = do
   emit (Just "") [] (Just "789")
   emit (Just "012") ["", "", ""] (Just "")
 
-testCase_NegativeEnum :: (?format :: Format) => IO ()
+testCase_NegativeEnum :: (?format :: Format, ?iterator :: Iterator) => IO ()
 testCase_NegativeEnum = do
   let emit = outputMessage . TestProtoNegativeEnum.WithNegativeEnum . Enumerated . Right
   emit TestProtoNegativeEnum.NegativeEnumNEGATIVE_ENUM_0
diff --git a/tests/Test/Proto/ToEncoder.hs b/tests/Test/Proto/ToEncoder.hs
index eb624b39..5276f8cd 100644
--- a/tests/Test/Proto/ToEncoder.hs
+++ b/tests/Test/Proto/ToEncoder.hs
@@ -27,6 +27,7 @@ import qualified Proto3.Suite.Form.Encode as FormE
 
 import           TestProto
 import qualified TestProtoImport
+import qualified TestProtoNegativeEnum
 import qualified TestProtoOneof
 import qualified TestProtoOneofImport
 import qualified TestProtoWrappers
@@ -421,4 +422,9 @@ instance ToEncoder MapTest
           FormE.field @"key" k .
           FormE.field @"value" v
 
+instance ToEncoder TestProtoNegativeEnum.WithNegativeEnum
+  where
+    toEncoder (TestProtoNegativeEnum.WithNegativeEnum f1) = FormE.fieldsToMessage $
+      FormE.field @"v" f1
+
 #endif
diff --git a/tests/decode.sh b/tests/decode.sh
index 7bf77a95..fe939ddd 100755
--- a/tests/decode.sh
+++ b/tests/decode.sh
@@ -11,10 +11,10 @@ ghc                                         \
     "$@"                                    \
     $hsTmpDir/TestProto.hs                  \
     $hsTmpDir/TestProtoImport.hs            \
+    $hsTmpDir/TestProtoNegativeEnum.hs      \
     $hsTmpDir/TestProtoOneof.hs             \
     $hsTmpDir/TestProtoOneofImport.hs       \
     $hsTmpDir/TestProtoWrappers.hs          \
-    $hsTmpDir/TestProtoNegativeEnum.hs      \
     tests/Test/Dhall/Orphan.hs              \
     tests/SimpleDecodeDotProto.hs           \
     >/dev/null
diff --git a/tests/encode.sh b/tests/encode.sh
index f23e67db..b5b1bfaf 100755
--- a/tests/encode.sh
+++ b/tests/encode.sh
@@ -11,10 +11,10 @@ ghc                                         \
     "$@"                                    \
     $hsTmpDir/TestProto.hs                  \
     $hsTmpDir/TestProtoImport.hs            \
+    $hsTmpDir/TestProtoNegativeEnum.hs      \
     $hsTmpDir/TestProtoOneof.hs             \
     $hsTmpDir/TestProtoOneofImport.hs       \
     $hsTmpDir/TestProtoWrappers.hs          \
-    $hsTmpDir/TestProtoNegativeEnum.hs      \
     tests/Test/Dhall/Orphan.hs              \
     tests/Test/Proto/ToEncoder.hs           \
     tests/SimpleEncodeDotProto.hs           \