diff --git a/nailgun-server/src/main/java/com/martiansoftware/nailgun/NGSession.java b/nailgun-server/src/main/java/com/martiansoftware/nailgun/NGSession.java
index d3ec493f..3a8f6203 100644
--- a/nailgun-server/src/main/java/com/martiansoftware/nailgun/NGSession.java
+++ b/nailgun-server/src/main/java/com/martiansoftware/nailgun/NGSession.java
@@ -223,7 +223,7 @@ public void run() {
                                 String key = line.substring(0, equalsIndex);
                                 String value = line.substring(equalsIndex + 1);
                                 remoteEnv.setProperty(key, value);
-                                LOGGER.fine(String.format("Setting env: key(%s)=value(%s).", key, value));
+                                LOGGER.fine("Setting env: key('" + key + "')=value('" + value + "').");
                             }
                             break;