diff --git a/gdb/ghc_gdb/ghc_heap.py b/gdb/ghc_gdb/ghc_heap.py
index 3ba284d27bbf158ad27c35be3912df2babd6f790..3d5508d164d008c963b61b5607c797d3031e252a 100644
--- a/gdb/ghc_gdb/ghc_heap.py
+++ b/gdb/ghc_gdb/ghc_heap.py
@@ -199,7 +199,7 @@ closurePrinters = build_closure_printers()
 
 @memoized
 def mmtk() -> bool:
-    return True
+    return False
 
 @memoized
 def heap_bounds() -> List[Tuple[Ptr, Ptr]]: