diff --git a/src/machine.cpp b/src/machine.cpp
index ddfb75617e..1ffca8b4ac 100644
--- a/src/machine.cpp
+++ b/src/machine.cpp
@@ -991,9 +991,11 @@ objectMonitor(Thread* t, object o)
   object p = hashMapFind(t, t->vm->monitorMap, o, objectHash, referenceEqual);
 
   if (p) {
-    fprintf(stderr, "found monitor %p for object 0x%x\n",
-            static_cast<System::Monitor*>(pointerValue(t, p)),
-            objectHash(t, o));
+    if (DebugMonitors) {
+      fprintf(stderr, "found monitor %p for object 0x%x\n",
+              static_cast<System::Monitor*>(pointerValue(t, p)),
+              objectHash(t, o));
+    }
 
     return static_cast<System::Monitor*>(pointerValue(t, p));
   } else {
@@ -1011,10 +1013,11 @@ objectMonitor(Thread* t, object o)
     object wr = makeWeakReference(t, o, t->vm->weakReferences);
     t->vm->weakReferences = wr;
 
-    fprintf(stderr, "made monitor %p for object 0x%x\n",
-            m,
-            objectHash(t, o));
-    fprintf(stderr, "new wr: %p\n", wr);
+    if (DebugMonitors) {
+      fprintf(stderr, "made monitor %p for object 0x%x\n",
+              m,
+              objectHash(t, o));
+    }
 
     hashMapInsert(t, t->vm->monitorMap, wr, p, referenceHash);
 
diff --git a/src/machine.h b/src/machine.h
index ad680c71ad..46d6042578 100644
--- a/src/machine.h
+++ b/src/machine.h
@@ -22,9 +22,9 @@
 namespace vm {
 
 const bool Verbose = false;
-const bool Debug = false;
 const bool DebugRun = false;
 const bool DebugStack = false;
+const bool DebugMonitors = false;
 
 const uintptr_t HashTakenMark = 1;
 const uintptr_t ExtendedMark = 2;