diff --git a/aeron-client/src/main/java/io/aeron/ClientConductor.java b/aeron-client/src/main/java/io/aeron/ClientConductor.java
index <HASH>..<HASH> 100644
--- a/aeron-client/src/main/java/io/aeron/ClientConductor.java
+++ b/aeron-client/src/main/java/io/aeron/ClientConductor.java
@@ -775,7 +775,7 @@ class ClientConductor implements Agent, DriverEventsListener
         }
         while (nanoClock.nanoTime() < deadlineNs);
 
-        throw new DriverTimeoutException("No response from MediaDriver within (ns):" + driverTimeoutNs);
+        throw new DriverTimeoutException("No response from MediaDriver within (ns): " + driverTimeoutNs);
     }
 
     private int onCheckTimeouts()
[Java] Error formatting.