diff --git a/target/linux/x86/64/config-4.9 b/target/linux/x86/64/config-4.9
index 9a54e8e594..c69a15bfe9 100644
--- a/target/linux/x86/64/config-4.9
+++ b/target/linux/x86/64/config-4.9
@@ -250,7 +250,7 @@ CONFIG_MODULES_USE_ELF_RELA=y
 # CONFIG_MPSC is not set
 CONFIG_MUTEX_SPIN_ON_OWNER=y
 CONFIG_NET_FLOW_LIMIT=y
-CONFIG_NR_CPUS=128
+CONFIG_NR_CPUS=512
 # CONFIG_NUMA is not set
 CONFIG_OUTPUT_FORMAT="elf64-x86-64"
 CONFIG_PADATA=y