diff --git a/src/pkg/runtime/defs_openbsd.go b/src/pkg/runtime/defs_openbsd.go
index 39224c988c..cf4e06d37b 100644
--- a/src/pkg/runtime/defs_openbsd.go
+++ b/src/pkg/runtime/defs_openbsd.go
@@ -104,7 +104,7 @@ const (
 	EVFILT_WRITE = C.EVFILT_WRITE
 )
 
-type TforkT C.struct___tfork
+type Tfork C.struct___tfork
 
 type SigaltstackT C.struct_sigaltstack
 type Sigcontext C.struct_sigcontext
@@ -118,4 +118,4 @@ type Timespec C.struct_timespec
 type Timeval C.struct_timeval
 type Itimerval C.struct_itimerval
 
-type KeventT C.struct_kevent
+type Kevent C.struct_kevent
diff --git a/src/pkg/runtime/defs_openbsd_386.h b/src/pkg/runtime/defs_openbsd_386.h
index 6b77e0084a..669a35c357 100644
--- a/src/pkg/runtime/defs_openbsd_386.h
+++ b/src/pkg/runtime/defs_openbsd_386.h
@@ -81,7 +81,7 @@ enum {
 	EVFILT_WRITE	= -0x2,
 };
 
-typedef struct TforkT TforkT;
+typedef struct Tfork Tfork;
 typedef struct SigaltstackT SigaltstackT;
 typedef struct Sigcontext Sigcontext;
 typedef struct Siginfo Siginfo;
@@ -93,7 +93,7 @@ typedef struct KeventT KeventT;
 
 #pragma pack on
 
-struct TforkT {
+struct Tfork {
 	byte	*tf_tcb;
 	int32	*tf_tid;
 	byte	*tf_stack;
diff --git a/src/pkg/runtime/defs_openbsd_amd64.h b/src/pkg/runtime/defs_openbsd_amd64.h
index 761e8e47df..9877f8b4c2 100644
--- a/src/pkg/runtime/defs_openbsd_amd64.h
+++ b/src/pkg/runtime/defs_openbsd_amd64.h
@@ -81,7 +81,7 @@ enum {
 	EVFILT_WRITE	= -0x2,
 };
 
-typedef struct TforkT TforkT;
+typedef struct Tfork Tfork;
 typedef struct SigaltstackT SigaltstackT;
 typedef struct Sigcontext Sigcontext;
 typedef struct Siginfo Siginfo;
@@ -93,7 +93,7 @@ typedef struct KeventT KeventT;
 
 #pragma pack on
 
-struct TforkT {
+struct Tfork {
 	byte	*tf_tcb;
 	int32	*tf_tid;
 	byte	*tf_stack;
diff --git a/src/pkg/runtime/os_openbsd.c b/src/pkg/runtime/os_openbsd.c
index dbd12a1282..a746385314 100644
--- a/src/pkg/runtime/os_openbsd.c
+++ b/src/pkg/runtime/os_openbsd.c
@@ -26,7 +26,7 @@ extern SigTab runtime·sigtab[];
 static Sigset sigset_none;
 static Sigset sigset_all = ~(Sigset)0;
 
-extern int32 runtime·tfork(TforkT *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
+extern int32 runtime·tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
 extern int32 runtime·thrsleep(void *ident, int32 clock_id, void *tsp, void *lock, const int32 *abort);
 extern int32 runtime·thrwakeup(void *ident, int32 n);
 
@@ -130,7 +130,7 @@ runtime·semawakeup(M *mp)
 void
 runtime·newosproc(M *mp, void *stk)
 {
-	TforkT param;
+	Tfork param;
 	Sigset oset;
 	int32 ret;
 
@@ -147,7 +147,7 @@ runtime·newosproc(M *mp, void *stk)
 	param.tf_stack = stk;
 
 	oset = runtime·sigprocmask(SIG_SETMASK, sigset_all);
-	ret = runtime·tfork(&param, sizeof(param), mp, mp->g0, runtime·mstart);
+	ret = runtime·tfork((byte*)&param, sizeof(param), mp, mp->g0, runtime·mstart);
 	runtime·sigprocmask(SIG_SETMASK, oset);
 
 	if(ret < 0) {
diff --git a/src/pkg/runtime/os_openbsd.go b/src/pkg/runtime/os_openbsd.go
index d3923aa615..681bdde82e 100644
--- a/src/pkg/runtime/os_openbsd.go
+++ b/src/pkg/runtime/os_openbsd.go
@@ -15,7 +15,7 @@ func raise(sig int32)
 func kqueue() int32
 func kevent(fd int32, ev1 unsafe.Pointer, nev1 int32, ev2 unsafe.Pointer, nev2 int32, ts unsafe.Pointer) int32
 func closeonexec(fd int32)
-func tfork(param *tforkt, psize uintptr, mm, gg, fn unsafe.Pointer) int32
+func tfork(param unsafe.Pointer, psize uintptr, mm, gg, fn unsafe.Pointer) int32
 func thrsleep(ident unsafe.Pointer, clock_id int32, tsp, lock, abort unsafe.Pointer) int32
 func thrwakeup(ident unsafe.Pointer, n int32) int32