diff --git a/src/main/java/Avalara/SDK/ApiClient.java b/src/main/java/Avalara/SDK/ApiClient.java
index 34cd6ff..9a06b2d 100644
--- a/src/main/java/Avalara/SDK/ApiClient.java
+++ b/src/main/java/Avalara/SDK/ApiClient.java
@@ -62,7 +62,7 @@
  */
 public class ApiClient {
 
-    private final String AVALARA_CLIENT_HEADER = "X-Avalara-Client";
+    private final String AVALARA_CLIENT_HEADER = "X-Avalara-SDK-Client";
     private final String AVALARA_VERSION = "avalara-version";
     private boolean debugging = false;
     private Map<String, String> defaultHeaderMap = new HashMap<String, String>();