diff --git a/dashboard/app/build/build.go b/dashboard/app/build/build.go
index 1a5bb49515..90ca344bd8 100644
--- a/dashboard/app/build/build.go
+++ b/dashboard/app/build/build.go
@@ -154,7 +154,7 @@ func (com *Commit) AddResult(c appengine.Context, r *Result) error {
 	var resultExists bool
 	for i, s := range com.ResultData {
 		// if there already exists result data for this builder at com, overwrite it.
-		if strings.HasPrefix(s, r.Builder+"|") {
+		if strings.HasPrefix(s, r.Builder+"|") && strings.HasSuffix(s, "|"+r.GoHash) {
 			resultExists = true
 			com.ResultData[i] = r.Data()
 		}