diff --git a/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java b/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java
index a6581e24d43b7f216b4d32c1b533b299fce93717..54116c43b752769b0ea39096ce537c2275d4f9ad 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java
@@ -93,7 +93,7 @@ class Sequences {
       return first;
     }
     if (areSimilar(xySequences)) {
-      MutableXySequence result = MutableXySequence.emptyCopyOf(getFirstSequence(xySequences));
+      MutableXySequence result = MutableXySequence.emptyCopyOf(first);
       for (XySequence xys : xySequences) {
         result.add(xys);
       }