diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Idriss_2014.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Idriss_2014.java
index 38579bb87febf9d1b5403c950c47ee16bd013e67..b9b3a36b57335df7653b31e5faddbc13d9f7d4c3 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Idriss_2014.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Idriss_2014.java
@@ -136,7 +136,7 @@ public class Idriss_2014 implements GroundMotionModel {
       double T = c.imt.period();
       s1 *= (T <= 0.05) ? log(0.05) : (T < 3.0) ? log(T) : log(3.0);
     } else {
-      s1 *= 0.05;
+      s1 *= log(0.05);
     }
     double s2 = 0.06;
     s2 *= (Mw <= 5.0) ? 5.0 : (Mw < 7.5) ? Mw : 7.5;