diff --git a/src/pkg/runtime/os_plan9.c b/src/pkg/runtime/os_plan9.c
index 98e449251a..fad5b2717f 100644
--- a/src/pkg/runtime/os_plan9.c
+++ b/src/pkg/runtime/os_plan9.c
@@ -317,12 +317,6 @@ runtime·semawakeup(M *mp)
 	runtime·plan9_semrelease(&mp->waitsemacount, 1);
 }
 
-void
-os·sigpipe(void)
-{
-	runtime·throw("too many writes on closed pipe");
-}
-
 static int64
 atolwhex(byte *p)
 {
diff --git a/src/pkg/runtime/os_plan9.go b/src/pkg/runtime/os_plan9.go
index 4a7b16fd64..c45d22551f 100644
--- a/src/pkg/runtime/os_plan9.go
+++ b/src/pkg/runtime/os_plan9.go
@@ -28,3 +28,7 @@ func errstr() string
 const stackSystem = 512
 
 type _Plink uintptr
+
+func os_sigpipe() {
+	gothrow("too many writes on closed pipe")
+}