diff --git a/src/integrate/ensemble_ti_rs.cu b/src/integrate/ensemble_ti_rs.cu
index 3acc82508..58440c697 100644
--- a/src/integrate/ensemble_ti_rs.cu
+++ b/src/integrate/ensemble_ti_rs.cu
@@ -280,5 +280,5 @@ double Ensemble_TI_RS::switch_func(double t) { return 1 / (1 + t * (1 / lambda_f
 double Ensemble_TI_RS::dswitch_func(double t)
 {
   double a = 1 / lambda_f - 1;
-  return -(a / pow((1 + a * t), 2)) / t_switch;
+  return -(a / pow((1 + a * t), 2.0)) / t_switch;
 }
\ No newline at end of file