diff --git a/arch/nt32/pthread_arch.h b/arch/nt32/pthread_arch.h
index d5f2553..f779af4 100644
--- a/arch/nt32/pthread_arch.h
+++ b/arch/nt32/pthread_arch.h
@@ -2,6 +2,7 @@
 
 #define	TP_ADJ(p)	(p)
 #define	CANCEL_REG_IP	16
+#define MC_PC           uc_eip
 
 extern uintptr_t __teb_sys_idx;
 extern uintptr_t __teb_libc_idx;
diff --git a/arch/nt64/pthread_arch.h b/arch/nt64/pthread_arch.h
index 5c15b69..05188f3 100644
--- a/arch/nt64/pthread_arch.h
+++ b/arch/nt64/pthread_arch.h
@@ -2,6 +2,7 @@
 
 #define	TP_ADJ(p)	(p)
 #define	CANCEL_REG_IP	0x1F
+#define MC_PC           uc_rip
 
 extern uintptr_t __teb_sys_idx;
 extern uintptr_t __teb_libc_idx;