diff --git a/src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/UserAgentHelper.java b/src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/UserAgentHelper.java
index 988da567f4..e54809c700 100644
--- a/src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/UserAgentHelper.java
+++ b/src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/UserAgentHelper.java
@@ -17,7 +17,7 @@ public class UserAgentHelper {
         // Parsing version numbers
         String detailedVersion = Version.getDetailedVersion();
         agentBuilder.append(getVersion(detailedVersion));
-        agentBuilder.append("; (");
+        agentBuilder.append(" (");
         agentBuilder.append(detailedVersion);
         agentBuilder.append("; ");
 
diff --git a/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/HubConnectionTest.java b/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/HubConnectionTest.java
index 051b5fed83..af01f5311c 100644
--- a/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/HubConnectionTest.java
+++ b/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/HubConnectionTest.java
@@ -1116,7 +1116,7 @@ class HubConnectionTest {
         hubConnection.start().timeout(1, TimeUnit.SECONDS).blockingAwait();
 
         AtomicBoolean done = new AtomicBoolean();
-        Single<String> result = hubConnection.invoke(String.class, "fixedMessage", null);
+        Single<String> result = hubConnection.invoke(String.class, "fixedMessage", (Object)null);
         result.doOnSuccess(value -> done.set(true)).subscribe();
         assertEquals("{\"type\":1,\"invocationId\":\"1\",\"target\":\"fixedMessage\",\"arguments\":[null]}" + RECORD_SEPARATOR, mockTransport.getSentMessages()[1]);
         assertFalse(done.get());
diff --git a/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/UserAgentTest.java b/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/UserAgentTest.java
index 59715223b9..362b035a27 100644
--- a/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/UserAgentTest.java
+++ b/src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/UserAgentTest.java
@@ -46,7 +46,7 @@ public class UserAgentTest {
 
         String detailedVersion = Version.getDetailedVersion();
         String handMadeUserAgent = "Microsoft SignalR/" + UserAgentHelper.getVersion(detailedVersion) +
-                "; (" + detailedVersion + "; " + UserAgentHelper.getOS() + "; Java; " +
+                " (" + detailedVersion + "; " + UserAgentHelper.getOS() + "; Java; " +
                 UserAgentHelper.getJavaVersion() + "; " + UserAgentHelper.getJavaVendor() + ")";
 
         assertEquals(handMadeUserAgent, userAgent);