diff --git a/src/main/java/org/itsallcode/luava/FunctionCallException.java b/src/main/java/org/itsallcode/luava/FunctionCallException.java
index c1dd78c..d0bf553 100644
--- a/src/main/java/org/itsallcode/luava/FunctionCallException.java
+++ b/src/main/java/org/itsallcode/luava/FunctionCallException.java
@@ -1,7 +1,7 @@
 package org.itsallcode.luava;
 
+@SuppressWarnings("serial")
 public class FunctionCallException extends LuaException {
-    private static final long serialVersionUID = 1L;
     private final String function;
     private final int errorCode;
     private final String message;
diff --git a/src/main/java/org/itsallcode/luava/LuaException.java b/src/main/java/org/itsallcode/luava/LuaException.java
index 65c1d7e..c1e23bb 100644
--- a/src/main/java/org/itsallcode/luava/LuaException.java
+++ b/src/main/java/org/itsallcode/luava/LuaException.java
@@ -1,8 +1,7 @@
 package org.itsallcode.luava;
 
+@SuppressWarnings("serial")
 public class LuaException extends RuntimeException {
-    private static final long serialVersionUID = 1L;
-
     public LuaException(final String message) {
         super(message);
     }
diff --git a/src/main/java/org/itsallcode/luava/LuaType.java b/src/main/java/org/itsallcode/luava/LuaType.java
index 323007f..2fa6f23 100644
--- a/src/main/java/org/itsallcode/luava/LuaType.java
+++ b/src/main/java/org/itsallcode/luava/LuaType.java
@@ -11,7 +11,7 @@ public enum LuaType {
 
     private final int type;
 
-    private LuaType(final int type) {
+    LuaType(final int type) {
         this.type = type;
     }