diff --git a/src/runtime/trace/trace_stack_test.go b/src/runtime/trace/trace_stack_test.go
index 0275279a6b..e7b8d57659 100644
--- a/src/runtime/trace/trace_stack_test.go
+++ b/src/runtime/trace/trace_stack_test.go
@@ -128,7 +128,8 @@ func TestTraceSymbolize(t *testing.T) {
 	wp.Write(data[:])
 	<-pipeReadDone
 
-	oldGoMaxProcs := runtime.GOMAXPROCS(1)
+	oldGoMaxProcs := runtime.GOMAXPROCS(0)
+	runtime.GOMAXPROCS(oldGoMaxProcs + 1)
 
 	Stop()