diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index fab603a..7434e64 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -692,6 +692,10 @@ static inline void hrtimer_data_pointer(struct hrtimer *timer)
 static inline void hrtimer_data_pointer(struct hrtimer *timer) {}
 #endif
 
+#ifndef NMI_VECTOR
+#define NMI_VECTOR 2
+#endif
+
 #ifndef MSR_MTRRcap
 #define MSR_MTRRcap            0x0fe
 #define MSR_MTRRfix64K_00000   0x250