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 71003387b..c11e1e5fc 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/launch/DefaultLauncher.java
@@ -75,14 +75,14 @@ public class DefaultLauncher extends Launcher {
             case HIGH:
                 if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
                     res.add("cmd", "/C", "start", "unused title", "/B", "/high");
-                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX) {
+                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX || OperatingSystem.CURRENT_OS == OperatingSystem.OSX) {
                     res.add("nice", "-n", "-5");
                 }
                 break;
             case ABOVE_NORMAL:
                 if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
                     res.add("cmd", "/C", "start", "unused title", "/B", "/abovenormal");
-                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX) {
+                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX || OperatingSystem.CURRENT_OS == OperatingSystem.OSX) {
                     res.add("nice", "-n", "-1");
                 }
                 break;
@@ -92,14 +92,14 @@ public class DefaultLauncher extends Launcher {
             case BELOW_NORMAL:
                 if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
                     res.add("cmd", "/C", "start", "unused title", "/B", "/belownormal");
-                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX) {
+                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX || OperatingSystem.CURRENT_OS == OperatingSystem.OSX) {
                     res.add("nice", "-n", "1");
                 }
                 break;
             case LOW:
                 if (OperatingSystem.CURRENT_OS == OperatingSystem.WINDOWS) {
                     res.add("cmd", "/C", "start", "unused title", "/B", "/low");
-                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX) {
+                } else if (OperatingSystem.CURRENT_OS == OperatingSystem.LINUX || OperatingSystem.CURRENT_OS == OperatingSystem.OSX) {
                     res.add("nice", "-n", "5");
                 }
                 break;