diff --git a/test/hotspot/jtreg/compiler/lib/template_framework/library/Operations.java b/test/hotspot/jtreg/compiler/lib/template_framework/library/Operations.java
index cb0e94c9fe8..1fe05cc2b6c 100644
--- a/test/hotspot/jtreg/compiler/lib/template_framework/library/Operations.java
+++ b/test/hotspot/jtreg/compiler/lib/template_framework/library/Operations.java
@@ -274,6 +274,7 @@ public final class Operations {
         ops.add(Expression.make(BOOLEANS, "Boolean.logicalXor(", BOOLEANS, ", ", BOOLEANS, ")"));
 
         // TODO: Math and other classes.
+        // Note: Math.copySign is non-deterministic because of NaN having encoding with sign bit set and unset.
 
         // Make sure the list is not modifiable.
         return List.copyOf(ops);
@@ -294,7 +295,8 @@ public final class Operations {
         ops.add(Expression.make(INTS, "Float16.compare(", FLOAT16, ",", FLOAT16, ")"));
         addComparisonOperations(ops, "Float16.compare", FLOAT16);
         ops.add(Expression.make(INTS, "(", FLOAT16, ").compareTo(",  FLOAT16, ")"));
-        ops.add(Expression.make(FLOAT16, "Float16.copySign(", FLOAT16, ",", FLOAT16, ")"));
+        // Note: There are NaN encodings with bit set or unset.
+        ops.add(Expression.make(FLOAT16, "Float16.copySign(", FLOAT16, ",", FLOAT16, ")", WITH_NONDETERMINISTIC_RESULT));
         ops.add(Expression.make(FLOAT16, "Float16.divide(", FLOAT16, ",", FLOAT16, ")"));
         ops.add(Expression.make(BOOLEANS, "", FLOAT16, ".equals(", FLOAT16, ")"));
         // Note: there are multiple NaN values with different bit representations.