diff --git a/common/src/main/java/io/netty/util/internal/PlatformDependent.java b/common/src/main/java/io/netty/util/internal/PlatformDependent.java
index c97014edc5..cc9846b78f 100644
--- a/common/src/main/java/io/netty/util/internal/PlatformDependent.java
+++ b/common/src/main/java/io/netty/util/internal/PlatformDependent.java
@@ -933,7 +933,9 @@ public final class PlatformDependent {
     }
 
     private static boolean isOsx0() {
-        String osname = SystemPropertyUtil.get("os.name", "").toLowerCase(Locale.US);
+        String osname = SystemPropertyUtil.get("os.name", "").toLowerCase(Locale.US)
+                .replaceAll("[^a-z0-9]+", "");
+        System.err.println("osname=" + osname);
         boolean osx = osname.startsWith("macosx") || osname.startsWith("osx");
 
         if (osx) {