diff --git a/go/squiggle.go b/go/squiggle.go
index b24f033e..4f312bec 100644
--- a/go/squiggle.go
+++ b/go/squiggle.go
@@ -51,7 +51,7 @@ type func64 func() float64
 
 func sample_mixture(fs []func64, weights []float64) float64 {
 	var sum_weights float64 = 0
-	for i_, weight := range weights {
+	for _, weight := range weights {
 		sum_weights += weight
 	}
 	return sum_weights