diff --git a/traps.h b/traps.h
index cb6f8a7..6e8a444 100644
--- a/traps.h
+++ b/traps.h
@@ -22,9 +22,6 @@
 #define T_MCHK          18      // machine check
 #define T_SIMDERR       19      // SIMD floating point error
 
-// These are arbitrarily chosen, but with care not to overlap
-// processor defined exceptions or interrupt vectors.
-#define T_SYSCALL       64      // system call
 #define T_DEFAULT      500      // catchall
 
 #define T_IRQ0          32      // IRQ 0 corresponds to int T_IRQ