diff --git a/search.go b/search.go
index cf1fe17a0..3f591a88e 100644
--- a/search.go
+++ b/search.go
@@ -603,9 +603,7 @@ func MemoryNeededForSearchResult(req *SearchRequest) uint64 {
 	// overhead from fields, highlighting
 	var d document.Document
 	if len(req.Fields) > 0 || req.Highlight != nil {
-		for i := 0; i < numDocMatches; i++ {
-			estimate += d.Size()
-		}
+		estimate += req.Size * d.Size()
 	}
 
 	return uint64(estimate)