diff --git a/test/hotspot/jtreg/vmTestbase/nsk/jdi/VoidValue/toString/tostring001.java b/test/hotspot/jtreg/vmTestbase/nsk/jdi/VoidValue/toString/tostring001.java
index f1d1baf06be..b2cdb6acef4 100644
--- a/test/hotspot/jtreg/vmTestbase/nsk/jdi/VoidValue/toString/tostring001.java
+++ b/test/hotspot/jtreg/vmTestbase/nsk/jdi/VoidValue/toString/tostring001.java
@@ -140,6 +140,10 @@ public class tostring001 {
 
         try {
             testedObject = testedClass.newInstance(thread, ctor, params, 0);
+            // Disable collection on testedObject. invokeMethod() will essentially do a
+            // vm.resume(), which gives GC a chance to run, which might result in this
+            // object being collected.
+            testedObject.disableCollection();
         } catch (Exception e) {
             throw new Failure("unexpected " + e + " when invoking debuggee's constructor");
         }
@@ -178,6 +182,7 @@ public class tostring001 {
         }
 
         display("Checking of debuggee's void value methods completed!");
+        testedObject.enableCollection();
         debuggee.resume();
     }