diff --git a/client/src/main/java/com/metamx/druid/QueryableNode.java b/client/src/main/java/com/metamx/druid/QueryableNode.java
index 749b2bd8b40..a9a97ec64af 100644
--- a/client/src/main/java/com/metamx/druid/QueryableNode.java
+++ b/client/src/main/java/com/metamx/druid/QueryableNode.java
@@ -248,7 +248,7 @@ public abstract class QueryableNode<T extends QueryableNode> extends Registering
   {
     if (requestLogger == null) {
       try {
-        setRequestLogger(Initialization.makeRequestLogger(getScheduledExecutorFactory(), getProps()));
+        setRequestLogger(Initialization.makeRequestLogger(getJsonMapper(), getScheduledExecutorFactory(), getProps()));
       }
       catch (IOException e) {
         throw Throwables.propagate(e);
diff --git a/client/src/main/java/com/metamx/druid/http/FileRequestLogger.java b/client/src/main/java/com/metamx/druid/http/FileRequestLogger.java
index 20425f9eb37..110e72f1c6f 100644
--- a/client/src/main/java/com/metamx/druid/http/FileRequestLogger.java
+++ b/client/src/main/java/com/metamx/druid/http/FileRequestLogger.java
@@ -19,6 +19,7 @@
 
 package com.metamx.druid.http;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Throwables;
 import com.google.common.io.Closeables;
 import com.metamx.common.concurrent.ScheduledExecutors;
@@ -38,6 +39,7 @@ import java.util.concurrent.ScheduledExecutorService;
  */
 public class FileRequestLogger implements RequestLogger
 {
+  private final ObjectMapper objectMapper;
   private final ScheduledExecutorService exec;
   private final File baseDir;
 
@@ -46,9 +48,11 @@ public class FileRequestLogger implements RequestLogger
   private volatile DateTime currentDay;
   private volatile FileWriter fileWriter;
 
-  public FileRequestLogger(ScheduledExecutorService exec, File baseDir)
+
+  public FileRequestLogger(ObjectMapper objectMapper, ScheduledExecutorService exec, File baseDir)
   {
     this.exec = exec;
+    this.objectMapper = objectMapper;
     this.baseDir = baseDir;
   }
 
@@ -110,7 +114,7 @@ public class FileRequestLogger implements RequestLogger
   {
     synchronized (lock) {
       fileWriter.write(
-          String.format("%s%n", requestLogLine.getLine())
+          String.format("%s%n", requestLogLine.getLine(objectMapper))
       );
       fileWriter.flush();
     }
diff --git a/client/src/main/java/com/metamx/druid/http/RequestLogLine.java b/client/src/main/java/com/metamx/druid/http/RequestLogLine.java
index e42be46fff6..452bd65656e 100644
--- a/client/src/main/java/com/metamx/druid/http/RequestLogLine.java
+++ b/client/src/main/java/com/metamx/druid/http/RequestLogLine.java
@@ -19,6 +19,8 @@
 
 package com.metamx.druid.http;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.base.Joiner;
 import com.metamx.druid.Query;
 import org.joda.time.DateTime;
@@ -40,14 +42,14 @@ public class RequestLogLine
     this.query = query;
   }
 
-  public String getLine()
+  public String getLine(ObjectMapper objectMapper) throws JsonProcessingException
   {
     return JOINER.join(
         Arrays.asList(
             timestamp,
             remoteAddr,
-            query
+            objectMapper.writeValueAsString(query)
         )
     );
   }
-}
\ No newline at end of file
+}
diff --git a/client/src/main/java/com/metamx/druid/initialization/Initialization.java b/client/src/main/java/com/metamx/druid/initialization/Initialization.java
index ba3b42d56e1..d173f5a95f7 100644
--- a/client/src/main/java/com/metamx/druid/initialization/Initialization.java
+++ b/client/src/main/java/com/metamx/druid/initialization/Initialization.java
@@ -348,9 +348,10 @@ public class Initialization
     return serviceProvider;
   }
 
-  public static RequestLogger makeRequestLogger(ScheduledExecutorFactory factory, Properties props) throws IOException
+  public static RequestLogger makeRequestLogger(ObjectMapper objectMapper, ScheduledExecutorFactory factory, Properties props) throws IOException
   {
     return new FileRequestLogger(
+        objectMapper,
         factory.create(1, "RequestLogger-%s"),
         new File(PropUtils.getProperty(props, "druid.request.logging.dir"))
     );