diff --git a/sliceops.go b/sliceops.go
index 9affb433..66e02516 100644
--- a/sliceops.go
+++ b/sliceops.go
@@ -115,7 +115,7 @@ func CumProd(receiver, s []float64) []float64 {
 	}
 	receiver[0] = s[0]
 	for i := 1; i < len(s); i++ {
-		receiver[i] = receiver[i-1] + s[i]
+		receiver[i] = receiver[i-1] * s[i]
 	}
 	return receiver
 }
diff --git a/sliceops_test.go b/sliceops_test.go
index 6163e44c..c1451eab 100644
--- a/sliceops_test.go
+++ b/sliceops_test.go
@@ -115,3 +115,16 @@ func TestCumSum(t *testing.T) {
 		t.Errorf("Wrong cumsum returned with non-nil receiver. Expected %v, returned %v", truth, val)
 	}
 }
+
+func TestCumProd(t *testing.T) {
+	s := []float64{3, 4, 1, 7, 5}
+	val := CumProd(nil, s)
+	truth := []float64{3, 12, 12, 84, 420}
+	if !Eq(val, truth, 1E-15) {
+		t.Errorf("Wrong cumprod returned with nil receiver. Expected %v, returned %v", truth, val)
+	}
+	val = CumProd(val, s)
+	if !Eq(val, truth, 1E-15) {
+		t.Errorf("Wrong cumprod returned with non-nil receiver. Expected %v, returned %v", truth, val)
+	}
+}