diff --git a/slf4j-api/src/main/java/org/slf4j/helpers/NOPLogger.java b/slf4j-api/src/main/java/org/slf4j/helpers/NOPLogger.java
index b98435fe..6681a500 100644
--- a/slf4j-api/src/main/java/org/slf4j/helpers/NOPLogger.java
+++ b/slf4j-api/src/main/java/org/slf4j/helpers/NOPLogger.java
@@ -25,7 +25,6 @@
 package org.slf4j.helpers;
 
 import org.slf4j.Logger;
-import org.slf4j.helpers.MarkerIgnoringBase;
 
 /**
  * A direct NOP (no operation) implementation of {@link Logger}.
diff --git a/slf4j-api/src/main/java/org/slf4j/helpers/NOPLoggerFactory.java b/slf4j-api/src/main/java/org/slf4j/helpers/NOPLoggerFactory.java
index b8a55dc9..0c98f753 100644
--- a/slf4j-api/src/main/java/org/slf4j/helpers/NOPLoggerFactory.java
+++ b/slf4j-api/src/main/java/org/slf4j/helpers/NOPLoggerFactory.java
@@ -26,7 +26,6 @@ package org.slf4j.helpers;
 
 import org.slf4j.ILoggerFactory;
 import org.slf4j.Logger;
-import org.slf4j.helpers.NOPLogger;
 
 /**
  * NOPLoggerFactory is an trivial implementation of {@link
diff --git a/slf4j-api/src/test/java/org/slf4j/helpers/SubstitutableLoggerTest.java b/slf4j-api/src/test/java/org/slf4j/helpers/SubstitutableLoggerTest.java
index be15564a..358199d7 100644
--- a/slf4j-api/src/test/java/org/slf4j/helpers/SubstitutableLoggerTest.java
+++ b/slf4j-api/src/test/java/org/slf4j/helpers/SubstitutableLoggerTest.java
@@ -40,7 +40,6 @@ import java.util.Set;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.event.EventRecodingLogger;
-import org.slf4j.helpers.SubstituteLogger;
 
 /**
  * @author Chetan Mehrotra
diff --git a/slf4j-ext/src/main/java/org/slf4j/NDC.java b/slf4j-ext/src/main/java/org/slf4j/NDC.java
index fbad2741..62e41d82 100644
--- a/slf4j-ext/src/main/java/org/slf4j/NDC.java
+++ b/slf4j-ext/src/main/java/org/slf4j/NDC.java
@@ -24,7 +24,6 @@
  */
 package org.slf4j;
 
-import org.slf4j.MDC;
 
 public class NDC {
     public final static String PREFIX = "NDC";