diff --git a/approvaltests/src/main/java/org/approvaltests/FailedFileLog.java b/approvaltests/src/main/java/org/approvaltests/FailedFileLog.java
new file mode 100644
index 000000000..c3352189c
--- /dev/null
+++ b/approvaltests/src/main/java/org/approvaltests/FailedFileLog.java
@@ -0,0 +1,30 @@
+package org.approvaltests;
+
+import com.spun.util.io.FileUtils;
+
+import java.io.File;
+
+import static org.approvaltests.ApprovedFileLog.APPROVAL_TEMP_DIRECTORY;
+
+public class FailedFileLog
+{
+  static
+  {
+    FileUtils.writeFile(get(), "");
+  }
+  public static File get()
+  {
+    File file = new File(APPROVAL_TEMP_DIRECTORY + "/.failed_comparison.log");
+    FileUtils.createIfNeeded(file.getAbsolutePath());
+    return file;
+  }
+  public static void log(File received, File approved)
+  {
+    File log = get();
+    FileUtils.appendToFile(log, String.format("%s -> %s\n", received.getAbsolutePath(), approved.getAbsolutePath()));
+  }
+
+  public static void touch() {
+    // Allows static initializer to be called
+  }
+}
diff --git a/approvaltests/src/main/java/org/approvaltests/approvers/FileApprover.java b/approvaltests/src/main/java/org/approvaltests/approvers/FileApprover.java
index fefcab66a..27e72277d 100644
--- a/approvaltests/src/main/java/org/approvaltests/approvers/FileApprover.java
+++ b/approvaltests/src/main/java/org/approvaltests/approvers/FileApprover.java
@@ -3,6 +3,7 @@
 import com.spun.util.ObjectUtils;
 import com.spun.util.io.FileUtils;
 import org.approvaltests.ApprovedFileLog;
+import org.approvaltests.FailedFileLog;
 import org.approvaltests.core.ApprovalFailureReporter;
 import org.approvaltests.core.ApprovalReporterWithCleanUp;
 import org.approvaltests.core.ApprovalWriter;
@@ -48,6 +49,7 @@ public VerifyResult approve()
   {
     tracker.assertUnique(approved.getAbsolutePath());
     ApprovedFileLog.log(approved);
+    FailedFileLog.touch();
     received = writer.writeReceivedFile(received);
     return approver.call(received, approved);
   }
@@ -61,6 +63,7 @@ public void cleanUpAfterSuccess(ApprovalFailureReporter reporter)
   }
   public VerifyResult reportFailure(ApprovalFailureReporter reporter)
   {
+    FailedFileLog.log(received, approved);
     reporter.report(received.getAbsolutePath(), approved.getAbsolutePath());
     if (reporter instanceof ReporterWithApprovalPower)
     {