diff --git a/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c b/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
index 592005b022a3..150ef28d889c 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
@@ -2326,10 +2326,8 @@ err:
 		int ret;
 #endif
 
-#ifdef illumos
 		if (copyin((void *)arg, &instr, sizeof (instr)) != 0)
 			return (EFAULT);
-#endif
 
 #ifdef notyet
 		if (!PRIV_POLICY_CHOICE(cr, PRIV_ALL, B_FALSE)) {
diff --git a/sys/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h b/sys/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h
index ec3582f5daa8..1d3d5a3bafd7 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h
@@ -42,7 +42,7 @@ extern "C" {
 #define	FASTTRAPIOC_MAKEPROBE	(FASTTRAPIOC | 1)
 #define	FASTTRAPIOC_GETINSTR	(FASTTRAPIOC | 2)
 #else
-#define	FASTTRAPIOC_GETINSTR	_IOWR('f', 2, uint8_t)
+#define	FASTTRAPIOC_GETINSTR	_IO('f', 2)
 #define	FASTTRAPIOC_MAKEPROBE	_IO('f', 3)
 #endif