diff --git a/src/hotspot/share/nmt/virtualMemoryTracker.cpp b/src/hotspot/share/nmt/virtualMemoryTracker.cpp
index 0f67ab9fa9f..471c9eafd0e 100644
--- a/src/hotspot/share/nmt/virtualMemoryTracker.cpp
+++ b/src/hotspot/share/nmt/virtualMemoryTracker.cpp
@@ -399,12 +399,16 @@ bool VirtualMemoryTracker::add_reserved_region(address base_addr, size_t size,
       }
 
       // Print some more details. Don't use UL here to avoid circularities.
-#ifdef ASSERT
       tty->print_cr("Error: existing region: [" INTPTR_FORMAT "-" INTPTR_FORMAT "), flag %u.\n"
                     "       new region: [" INTPTR_FORMAT "-" INTPTR_FORMAT "), flag %u.",
                     p2i(reserved_rgn->base()), p2i(reserved_rgn->end()), (unsigned)reserved_rgn->flag(),
                     p2i(base_addr), p2i(base_addr + size), (unsigned)flag);
-#endif
+      if (MemTracker::tracking_level() == NMT_detail) {
+        tty->print_cr("Existing region allocated from:");
+        reserved_rgn->call_stack()->print_on(tty);
+        tty->print_cr("New region allocated from:");
+        stack.print_on(tty);
+      }
       ShouldNotReachHere();
       return false;
     }