diff --git a/lib/std/mem.zig b/lib/std/mem.zig
index 7c8e914b57..61d6b84874 100644
--- a/lib/std/mem.zig
+++ b/lib/std/mem.zig
@@ -2080,7 +2080,6 @@ fn testReadIntImpl() !void {
 }
 
 test "writeIntSlice" {
-    if (@import("builtin").zig_backend != .stage1) return error.SkipZigTest; // TODO
     try testWriteIntImpl();
     comptime try testWriteIntImpl();
 }
diff --git a/src/value.zig b/src/value.zig
index 60c212a84f..e5332a72e7 100644
--- a/src/value.zig
+++ b/src/value.zig
@@ -2414,6 +2414,7 @@ pub const Value = extern union {
                 return false;
             },
             .@"union" => return val.cast(Payload.Union).?.data.val.canMutateComptimeVarState(),
+            .slice => return val.castTag(.slice).?.data.ptr.canMutateComptimeVarState(),
             else => return false,
         }
     }