diff --git a/unix/syscall_illumos.go b/unix/syscall_illumos.go
index 8d5f294c..e48244a9 100644
--- a/unix/syscall_illumos.go
+++ b/unix/syscall_illumos.go
@@ -20,10 +20,9 @@ func bytes2iovec(bs [][]byte) []Iovec {
 	for i, b := range bs {
 		iovecs[i].SetLen(len(b))
 		if len(b) > 0 {
-			// somehow Iovec.Base on illumos is (*int8), not (*byte)
-			iovecs[i].Base = (*int8)(unsafe.Pointer(&b[0]))
+			iovecs[i].Base = &b[0]
 		} else {
-			iovecs[i].Base = (*int8)(unsafe.Pointer(&_zero))
+			iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero))
 		}
 	}
 	return iovecs
diff --git a/unix/syscall_solaris.go b/unix/syscall_solaris.go
index 932996c7..cd492d7a 100644
--- a/unix/syscall_solaris.go
+++ b/unix/syscall_solaris.go
@@ -457,10 +457,10 @@ func recvmsgRaw(fd int, p, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn
 	msg.Namelen = uint32(SizeofSockaddrAny)
 	var iov Iovec
 	if len(p) > 0 {
-		iov.Base = (*int8)(unsafe.Pointer(&p[0]))
+		iov.Base = &p[0]
 		iov.SetLen(len(p))
 	}
-	var dummy int8
+	var dummy byte
 	if len(oob) > 0 {
 		// receive at least one normal byte
 		if len(p) == 0 {
@@ -486,10 +486,10 @@ func sendmsgN(fd int, p, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags i
 	msg.Namelen = uint32(salen)
 	var iov Iovec
 	if len(p) > 0 {
-		iov.Base = (*int8)(unsafe.Pointer(&p[0]))
+		iov.Base = &p[0]
 		iov.SetLen(len(p))
 	}
-	var dummy int8
+	var dummy byte
 	if len(oob) > 0 {
 		// send at least one normal byte
 		if len(p) == 0 {
diff --git a/unix/types_solaris.go b/unix/types_solaris.go
index 5360e5d3..7d79700d 100644
--- a/unix/types_solaris.go
+++ b/unix/types_solaris.go
@@ -74,6 +74,12 @@ struct sockaddr_any {
 	char pad[sizeof(union sockaddr_all) - sizeof(struct sockaddr)];
 };
 
+// go_iovec is used to get *byte as the base address for Iovec.
+struct goIovec {
+	void*  iov_base;
+	size_t iov_len;
+};
+
 */
 import "C"
 
@@ -150,7 +156,7 @@ type _Socklen C.socklen_t
 
 type Linger C.struct_linger
 
-type Iovec C.struct_iovec
+type Iovec C.struct_goIovec
 
 type IPMreq C.struct_ip_mreq
 
diff --git a/unix/ztypes_solaris_amd64.go b/unix/ztypes_solaris_amd64.go
index ad4aad27..c1a9b83a 100644
--- a/unix/ztypes_solaris_amd64.go
+++ b/unix/ztypes_solaris_amd64.go
@@ -178,7 +178,7 @@ type Linger struct {
 }
 
 type Iovec struct {
-	Base *int8
+	Base *byte
 	Len  uint64
 }