diff --git a/src/northbridge/amd/agesa/family15tn/northbridge.c b/src/northbridge/amd/agesa/family15tn/northbridge.c
index e82dae1..675be14 100644
--- a/src/northbridge/amd/agesa/family15tn/northbridge.c
+++ b/src/northbridge/amd/agesa/family15tn/northbridge.c
@@ -36,7 +36,6 @@
 #include <Porting.h>
 #include <Options.h>
 #include <Topology.h>
-#include <cpuRegisters.h>
 
 #include <northbridge/amd/agesa/agesawrapper.h>
 #include <northbridge/amd/agesa/state_machine.h>
@@ -921,7 +920,7 @@
 #endif
 
 	/* Get Max Number of cores(MNC) */
-	coreid_bits = (cpuid_ecx(AMD_CPUID_ASIZE_PCCOUNT) & 0x0000F000) >> 12;
+	coreid_bits = (cpuid_ecx(0x80000008) & 0x0000F000) >> 12;
 	core_max = 1 << (coreid_bits & 0x000F); //mnc
 
 	ApicIdCoreIdSize = ((cpuid_ecx(0x80000008)>>12) & 0xF);