--- a/test/hotspot/jtreg/runtime/CommandLine/OptionsValidation/common/optionsvalidation/JVMOption.java	Wed Nov 13 11:21:15 2019 +0100
+++ b/test/hotspot/jtreg/runtime/CommandLine/OptionsValidation/common/optionsvalidation/JVMOption.java	Wed Nov 13 11:37:29 2019 +0100
@@ -400,8 +400,7 @@
         }
 
         if (GCType != null &&
-            !(prepend.contains("-XX:+UseConcMarkSweepGC") ||
-              prepend.contains("-XX:+UseSerialGC") ||
+            !(prepend.contains("-XX:+UseSerialGC") ||
               prepend.contains("-XX:+UseParallelGC") ||
               prepend.contains("-XX:+UseG1GC"))) {
             explicitGC = GCType;