diff --git a/src/prolog/heap_print.rs b/src/prolog/heap_print.rs
index 21e568ce..0bc8b0d9 100644
--- a/src/prolog/heap_print.rs
+++ b/src/prolog/heap_print.rs
@@ -222,7 +222,7 @@ impl<'a, Formatter: HeapCellValueFormatter, Outputter: HeapCellValueOutputter>
                             delimit.set(false);
                         },
                     TokenOrRedirect::CloseList(delimit) =>
-                        if delimit.get() == true {
+                        if delimit.get() {
                             self.outputter.append("]");
                         },
                     TokenOrRedirect::HeadTailSeparator =>