diff --git a/test/hotspot/jtreg/compiler/intrinsics/string/TestStringCompareToDifferentLength.java b/test/hotspot/jtreg/compiler/intrinsics/string/TestStringCompareToDifferentLength.java
index aaee43e6882..26bc03c271b 100644
--- a/test/hotspot/jtreg/compiler/intrinsics/string/TestStringCompareToDifferentLength.java
+++ b/test/hotspot/jtreg/compiler/intrinsics/string/TestStringCompareToDifferentLength.java
@@ -24,20 +24,20 @@
 
 /*
  * @test
- * @requires os.arch=="aarch64"
+ * @requires os.arch=="aarch64" | os.arch=="riscv64"
  * @summary String::compareTo implementation uses different algorithms for
  *          different string length. This test creates string with specified
  *          size and longer string, which is same at beginning.
  *          Expecting length delta to be returned. Test class takes 2
  *          parameters: <string length>, <maximum string length delta>
- *          Input parameters for this test are set according to Aarch64
+ *          Input parameters for this test are set according to Aarch64/RISC-V
  *          String::compareTo intrinsic implementation specifics. Aarch64
  *          implementation has 1, 4, 8 -bytes loops for length < 72 and
- *          16, 32, 64 -characters loops for length >= 72. Code is also affected
+ *          16, 32, 64 -characters loops for length >= 72. Aarch64 Code is also affected
  *          by SoftwarePrefetchHintDistance vm flag value.
- * @run main/othervm -XX:SoftwarePrefetchHintDistance=192 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90 192 193 208 209
- * @run main/othervm -XX:SoftwarePrefetchHintDistance=16 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90
- * @run main/othervm -XX:SoftwarePrefetchHintDistance=-1 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:SoftwarePrefetchHintDistance=192 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90 192 193 208 209
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:SoftwarePrefetchHintDistance=16 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:SoftwarePrefetchHintDistance=-1 compiler.intrinsics.string.TestStringCompareToDifferentLength 4 2 5 10 13 17 20 23 24 25 71 72 73 88 90
  */
 
 package compiler.intrinsics.string;