diff --git a/generator/actions.ml b/generator/actions.ml
index 429a2d815..a6a6dade9 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -3299,6 +3299,7 @@ This is the same as the C<lstat(2)> system call." };
   { defaults with
     name = "c_pointer";
     style = RInt64 "ptr", [], [];
+    fish_output = Some FishOutputHexadecimal;
     tests = [
       InitNone, Always, TestRun (
         [["c_pointer"]]), []