diff --git a/util.go b/util.go
index e176af9..ffdddf2 100644
--- a/util.go
+++ b/util.go
@@ -107,8 +107,10 @@ func project(entries records, features featureMap, featureName string, minScore
 
 	var projection []queryProjection
 	stepRange(-1.0, 1.0, steps, func(sample float64) {
-		sampleFeatures[featureName] = sample
+		sample, sampleFeatures[featureName] = sampleFeatures[featureName], sample
 		compatibility, count := statRecords(entries, sampleFeatures, minScore)
+		sample, sampleFeatures[featureName] = sampleFeatures[featureName], sample
+
 		projection = append(projection, queryProjection{compatibility, count, sample})
 	})