diff --git a/test/hotspot/jtreg/runtime/NMT/MallocStressTest.java b/test/hotspot/jtreg/runtime/NMT/MallocStressTest.java
index 730dcea3e3d..8d356055c30 100644
--- a/test/hotspot/jtreg/runtime/NMT/MallocStressTest.java
+++ b/test/hotspot/jtreg/runtime/NMT/MallocStressTest.java
@@ -57,21 +57,19 @@ public class MallocStressTest {
         release
     };
 
-    static TestPhase phase = TestPhase.alloc;
+    static volatile TestPhase phase = TestPhase.alloc;
 
     // malloc'd memory
-    static ArrayList<MallocMemory>  mallocd_memory = new ArrayList<MallocMemory>();
+    static final ArrayList<MallocMemory>  mallocd_memory = new ArrayList<MallocMemory>();
     static long                     mallocd_total  = 0;
     static WhiteBox                 whiteBox;
     static AtomicInteger            pause_count = new AtomicInteger();
 
-    static boolean                  is_64_bit_system;
+    static final boolean            is_64_bit_system = Platform.is64bit();
 
     private static boolean is_64_bit_system() { return is_64_bit_system; }
 
     public static void main(String args[]) throws Exception {
-        is_64_bit_system = (Platform.is64bit());
-
         OutputAnalyzer output;
         whiteBox = WhiteBox.getWhiteBox();