diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c
index 4cccabb226dbf..8b99e403e68ce 100644
--- a/tools/power/x86/intel-speed-select/isst-config.c
+++ b/tools/power/x86/intel-speed-select/isst-config.c
@@ -25,7 +25,7 @@ static FILE *outf;
 static int cpu_model;
 static int cpu_stepping;
 
-#define MAX_CPUS_IN_ONE_REQ 64
+#define MAX_CPUS_IN_ONE_REQ 256
 static short max_target_cpus;
 static unsigned short target_cpus[MAX_CPUS_IN_ONE_REQ];