diff --git a/yearclass/src/main/java/com/facebook/device/yearclass/YearClass.java b/yearclass/src/main/java/com/facebook/device/yearclass/YearClass.java
index c74ec62..b57e5e5 100644
--- a/yearclass/src/main/java/com/facebook/device/yearclass/YearClass.java
+++ b/yearclass/src/main/java/com/facebook/device/yearclass/YearClass.java
@@ -26,7 +26,7 @@ public class YearClass {
   private static final long MB = 1024 * 1024;
   private static final int MHZ_IN_KHZ = 1000;
 
-  private static Integer mYearCategory;
+  private volatile static Integer mYearCategory;
 
   /**
    * Entry Point of YearClass. Extracts YearClass variable with memoizing.
@@ -168,4 +168,4 @@ private static int getRamYear(Context c) {
     if (totalRam <= 2048 * MB) return CLASS_2013;
     return CLASS_2014;
   }
-}
\ No newline at end of file
+}