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 54116c43b752769b0ea39096ce537c2275d4f9ad..4cf30b05c88355d07a4e1d273e73a78fd2dc996d 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/data/Sequences.java
@@ -112,7 +112,7 @@ class Sequences {
         combinedMap.values());
   }
 
-  static ArrayXySequence getFirstSequence(Collection<XySequence> xySequences) {
+  private static ArrayXySequence getFirstSequence(Collection<XySequence> xySequences) {
     // Safe covariant cast
     return (ArrayXySequence) xySequences.iterator().next();
   }