diff --git a/src/js/fable-core/Long.js b/src/js/fable-core/Long.js
index 6ba6b7a139..dd4ed33735 100644
--- a/src/js/fable-core/Long.js
+++ b/src/js/fable-core/Long.js
@@ -198,7 +198,6 @@ export function fromInteger(value, unsigned, kind) {
         case 2: x = value >> 0; xh = x; break;
         case 6: x = value >>> 0;
     }
-    if (unsigned) xh = 0;
     return fromBits(x, xh >> 31, unsigned);
 }
 
diff --git a/tests/Main/ConvertTests.fs b/tests/Main/ConvertTests.fs
index 75d466e614..353c8aa553 100644
--- a/tests/Main/ConvertTests.fs
+++ b/tests/Main/ConvertTests.fs
@@ -255,7 +255,7 @@ let tests =
     testCase "Special cases conversion to/from Int64 work" <| fun () ->
         let xn = -1L
         let xnu = 0xFFFFFFFFFFFFFFFFuL
-        -1 |> uint64 |> equal 0xFFFFFFFFuL
+        -1 |> uint64 |> equal xnu
         0xFFFFFFFFu |> int64 |> equal 0xFFFFFFFFL
         xn |> uint64 |> equal xnu
         xnu |> int64 |> equal -1L