diff --git a/src/main/java/org/icann/czds/sdk/client/CzdsClient.java b/src/main/java/org/icann/czds/sdk/client/CzdsClient.java
index 0b55f8e..be9874a 100644
--- a/src/main/java/org/icann/czds/sdk/client/CzdsClient.java
+++ b/src/main/java/org/icann/czds/sdk/client/CzdsClient.java
@@ -38,7 +38,7 @@ public CzdsClient(ClientConfiguration clientConfiguration) {
     }
 
     protected String getAuthenticationUrl() {
-        return StringUtils.appendIfMissing(clientConfiguration.getAuthenticationBaseUrl(), "/") + "api/authenticate/";
+        return StringUtils.appendIfMissing(clientConfiguration.getAuthenticationBaseUrl(), "/") + "api/authenticate";
     }
 
     protected CloseableHttpResponse makeHeadRequest(String url) throws IOException, AuthenticationException {