diff --git a/src/runtime/defs_windows.go b/src/runtime/defs_windows.go
index 7ce67974141..5dfb83a7cf6 100644
--- a/src/runtime/defs_windows.go
+++ b/src/runtime/defs_windows.go
@@ -41,6 +41,7 @@ const (
 	DUPLICATE_SAME_ACCESS   = C.DUPLICATE_SAME_ACCESS
 	THREAD_PRIORITY_HIGHEST = C.THREAD_PRIORITY_HIGHEST
 
+	SIGPROF          = 0 // dummy value for badsignal
 	SIGINT           = C.SIGINT
 	CTRL_C_EVENT     = C.CTRL_C_EVENT
 	CTRL_BREAK_EVENT = C.CTRL_BREAK_EVENT
diff --git a/src/runtime/defs_windows_386.go b/src/runtime/defs_windows_386.go
index abec2d839fd..450a3717691 100644
--- a/src/runtime/defs_windows_386.go
+++ b/src/runtime/defs_windows_386.go
@@ -15,6 +15,7 @@ const (
 	_DUPLICATE_SAME_ACCESS   = 0x2
 	_THREAD_PRIORITY_HIGHEST = 0x2
 
+	_SIGPROF          = 0 // dummy value for badsignal
 	_SIGINT           = 0x2
 	_CTRL_C_EVENT     = 0x0
 	_CTRL_BREAK_EVENT = 0x1
diff --git a/src/runtime/defs_windows_amd64.go b/src/runtime/defs_windows_amd64.go
index 81b13597b75..ed28576aac1 100644
--- a/src/runtime/defs_windows_amd64.go
+++ b/src/runtime/defs_windows_amd64.go
@@ -15,6 +15,7 @@ const (
 	_DUPLICATE_SAME_ACCESS   = 0x2
 	_THREAD_PRIORITY_HIGHEST = 0x2
 
+	_SIGPROF          = 0 // dummy value for badsignal
 	_SIGINT           = 0x2
 	_CTRL_C_EVENT     = 0x0
 	_CTRL_BREAK_EVENT = 0x1
diff --git a/src/runtime/os2_plan9.go b/src/runtime/os2_plan9.go
index f64f4c8dab4..ca9cee767fc 100644
--- a/src/runtime/os2_plan9.go
+++ b/src/runtime/os2_plan9.go
@@ -69,4 +69,6 @@ const (
 	_SIGINTDIV = 4
 	_SIGFLOAT  = 5
 	_SIGTRAP   = 6
+	// dummy value defined for badsignal
+	_SIGPROF   = 0
 )
diff --git a/src/runtime/sigqueue.go b/src/runtime/sigqueue.go
index a7607903969..543651076d3 100644
--- a/src/runtime/sigqueue.go
+++ b/src/runtime/sigqueue.go
@@ -160,8 +160,13 @@ func badsignal(sig uintptr) {
 	// call to cgocallback below will bring down the whole process.
 	// It's better to miss a few SIGPROF signals than to abort in this case.
 	// See http://golang.org/issue/9456.
-	if sig == _SIGPROF && needextram != 0 {
-		return
+	switch GOOS {
+	case "windows", "plan9":
+		// no actual SIGPROF is defined, nothing to do
+	default:
+		if sig == _SIGPROF && needextram != 0 {
+			return
+		}
 	}
 	cgocallback(unsafe.Pointer(funcPC(sigsend)), noescape(unsafe.Pointer(&sig)), unsafe.Sizeof(sig))
 }