diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
index 704cefa78745..485ac65ffa91 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
@@ -306,15 +306,14 @@ typedef enum dtrace_probespec {
 #define	DIF_SUBR_TOUPPER		44
 #define	DIF_SUBR_TOLOWER		45
 #define	DIF_SUBR_MEMREF			46
-#define	DIF_SUBR_UNUSED			47
-#define	DIF_SUBR_SX_SHARED_HELD		48
-#define	DIF_SUBR_SX_EXCLUSIVE_HELD	49
-#define	DIF_SUBR_SX_ISEXCLUSIVE		50
-#define	DIF_SUBR_MEMSTR			51
-#define	DIF_SUBR_GETF			52
-#define	DIF_SUBR_JSON			53
-#define	DIF_SUBR_STRTOLL		54
-#define	DIF_SUBR_MAX			54	/* max subroutine value */
+#define	DIF_SUBR_SX_SHARED_HELD		47
+#define	DIF_SUBR_SX_EXCLUSIVE_HELD	48
+#define	DIF_SUBR_SX_ISEXCLUSIVE		49
+#define	DIF_SUBR_MEMSTR			50
+#define	DIF_SUBR_GETF			51
+#define	DIF_SUBR_JSON			52
+#define	DIF_SUBR_STRTOLL		53
+#define	DIF_SUBR_MAX			53	/* max subroutine value */
 
 typedef uint32_t dif_instr_t;