diff --git a/src/soc/amd/common/block/cpu/noncar/cpu.c b/src/soc/amd/common/block/cpu/noncar/cpu.c
index 136cb42e0e..74b29cdb66 100644
--- a/src/soc/amd/common/block/cpu/noncar/cpu.c
+++ b/src/soc/amd/common/block/cpu/noncar/cpu.c
@@ -26,6 +26,11 @@ unsigned int smbios_processor_family(struct cpuid_result res)
 	return 0x6b; /* Zen */
 }
 
+unsigned int smbios_processor_external_clock(void)
+{
+	return 100; /* 100 MHz */
+}
+
 void set_cstate_io_addr(void)
 {
 	msr_t cst_addr;