diff --git a/derby/derby.go b/derby/derby.go
index f753d9e..80318f6 100644
--- a/derby/derby.go
+++ b/derby/derby.go
@@ -213,7 +213,7 @@ func (dc *DerbyClock) readLoop() {
 			} else if b[0] == '\n' {
 				// Check if we should consider the race complete
 				dc.mu.Lock()
-				if dc.status == StatusRunning && results != nil {
+				if dc.status == StatusRunning && len(results) > 0 {
 					dc.status = StatusFinished
 					dc.mu.Unlock()