diff --git a/src/main/java/org/swisspush/redisques/exception/ThriftyExceptionFactory.java b/src/main/java/org/swisspush/redisques/exception/ThriftyExceptionFactory.java
index a73ebe4..0ab219f 100644
--- a/src/main/java/org/swisspush/redisques/exception/ThriftyExceptionFactory.java
+++ b/src/main/java/org/swisspush/redisques/exception/ThriftyExceptionFactory.java
@@ -12,6 +12,9 @@
  */
 class ThriftyExceptionFactory implements ExceptionFactory {
 
+    ThriftyExceptionFactory() {
+    }
+
     @Override
     public ReplyException newReplyException(ReplyFailure failureType, int failureCode, String message) {
         return new NoStackReplyException(failureType, failureCode, message);
diff --git a/src/main/java/org/swisspush/redisques/exception/WastefulExceptionFactory.java b/src/main/java/org/swisspush/redisques/exception/WastefulExceptionFactory.java
index a6745d3..2656c30 100644
--- a/src/main/java/org/swisspush/redisques/exception/WastefulExceptionFactory.java
+++ b/src/main/java/org/swisspush/redisques/exception/WastefulExceptionFactory.java
@@ -13,6 +13,9 @@
  */
 class WastefulExceptionFactory implements ExceptionFactory {
 
+    WastefulExceptionFactory() {
+    }
+
     @Override
     public ReplyException newReplyException(ReplyFailure failureType, int failureCode, String message) {
         return new ReplyException(failureType, failureCode, message);