diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
index 8291c9cc8..028125f79 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
@@ -180,22 +180,14 @@ public class DefaultLauncher extends Launcher {
                 res.addDefault("-Duser.home=", options.getGameDir().getParent());
 
             // Using G1GC with its settings by default
-            if (options.getJava().getParsedVersion() >= JavaVersion.JAVA_8) {
-                boolean addG1Args = true;
-                for (String javaArg : options.getJavaArguments()) {
-                    if ("-XX:-UseG1GC".equals(javaArg) || (javaArg.startsWith("-XX:+Use") && javaArg.endsWith("GC"))) {
-                        addG1Args = false;
-                        break;
-                    }
-                }
-                if (addG1Args) {
-                    res.addUnstableDefault("UnlockExperimentalVMOptions", true);
-                    res.addUnstableDefault("UseG1GC", true);
-                    res.addUnstableDefault("G1NewSizePercent", "20");
-                    res.addUnstableDefault("G1ReservePercent", "20");
-                    res.addUnstableDefault("MaxGCPauseMillis", "50");
-                    res.addUnstableDefault("G1HeapRegionSize", "32m");
-                }
+            if (options.getJava().getParsedVersion() >= JavaVersion.JAVA_8
+                    && res.noneMatch(arg -> "-XX:-UseG1GC".equals(arg) || (arg.startsWith("-XX:+Use") && arg.endsWith("GC")))) {
+                res.addUnstableDefault("UnlockExperimentalVMOptions", true);
+                res.addUnstableDefault("UseG1GC", true);
+                res.addUnstableDefault("G1NewSizePercent", "20");
+                res.addUnstableDefault("G1ReservePercent", "20");
+                res.addUnstableDefault("MaxGCPauseMillis", "50");
+                res.addUnstableDefault("G1HeapRegionSize", "32m");
             }
 
             res.addUnstableDefault("UseAdaptiveSizePolicy", false);
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/CommandBuilder.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/CommandBuilder.java
index eb61ba746..c06117f4b 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/CommandBuilder.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/platform/CommandBuilder.java
@@ -211,6 +211,10 @@ public final class CommandBuilder {
         return raw.removeIf(i -> pred.test(i.arg));
     }
 
+    public boolean noneMatch(Predicate<String> predicate) {
+        return raw.stream().noneMatch(it -> predicate.test(it.arg));
+    }
+
     @Override
     public String toString() {
         return raw.stream().map(i -> i.parse ? parse(i.arg) : i.arg).collect(Collectors.joining(" "));