diff --git a/src/soc/amd/stoneyridge/cpu.c b/src/soc/amd/stoneyridge/cpu.c
index e691a51..94beed8 100644
--- a/src/soc/amd/stoneyridge/cpu.c
+++ b/src/soc/amd/stoneyridge/cpu.c
@@ -43,7 +43,7 @@
 
 static int get_cpu_count(void)
 {
-	return (pci_read_config16(SOC_HT_DEV, D18F0_CPU_CNT) & CPU_CNT_MASK) + 1;
+	return 1 + (cpuid_ecx(0x80000008) & 0xff);
 }
 
 static const struct mp_ops mp_ops = {