diff --git a/sys/amd64/include/trap.h b/sys/amd64/include/trap.h
index f0176b2c97e7..d8e36b5aaf3d 100644
--- a/sys/amd64/include/trap.h
+++ b/sys/amd64/include/trap.h
@@ -62,6 +62,8 @@
 #define	T_MCHK		28	/* machine check trap */
 #define	T_XMMFLT	29	/* SIMD floating-point exception */
 #define	T_RESERVED	30	/* reserved (unknown) */
+#define	T_DTRACE_RET	31	/* DTrace pid return */
+#define	T_DTRACE_PROBE	32	/* DTrace fasttrap probe */
 
 /* XXX most of the following codes aren't used, but could be. */
 
diff --git a/sys/i386/include/trap.h b/sys/i386/include/trap.h
index f0176b2c97e7..d8e36b5aaf3d 100644
--- a/sys/i386/include/trap.h
+++ b/sys/i386/include/trap.h
@@ -62,6 +62,8 @@
 #define	T_MCHK		28	/* machine check trap */
 #define	T_XMMFLT	29	/* SIMD floating-point exception */
 #define	T_RESERVED	30	/* reserved (unknown) */
+#define	T_DTRACE_RET	31	/* DTrace pid return */
+#define	T_DTRACE_PROBE	32	/* DTrace fasttrap probe */
 
 /* XXX most of the following codes aren't used, but could be. */