diff --git a/src/soc/intel/xeon_sp/gnr/Kconfig b/src/soc/intel/xeon_sp/gnr/Kconfig
index fae9d8d5ee..bc703b77d3 100644
--- a/src/soc/intel/xeon_sp/gnr/Kconfig
+++ b/src/soc/intel/xeon_sp/gnr/Kconfig
@@ -30,7 +30,7 @@ config FSP_HEADER_PATH
 
 config MAX_CPUS
 	int
-	default 255
+	default 512
 
 config PCR_BASE_ADDRESS
 	hex