diff --git a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiInplaceMojo.java b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiInplaceMojo.java
index 79b230f..f2b9d3b 100644
--- a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiInplaceMojo.java
+++ b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiInplaceMojo.java
@@ -36,7 +36,7 @@
  * <p>
  * This mojo converts files inplace, it is not recommended to execute it on src subdirectories.
  */
-@Mojo(name = "inplace", defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
+@Mojo(name = "inplace", threadSafe = true, defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
 public class Native2AsciiInplaceMojo extends AbstractNative2AsciiMojo {
 
   /**
diff --git a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiMojo.java b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiMojo.java
index c89d4e2..90bfcf5 100644
--- a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiMojo.java
+++ b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiMojo.java
@@ -32,7 +32,7 @@
  * Converts files with characters in any supported character encoding to one with ASCII and/or
  * Unicode escapes.
  */
-@Mojo(name = "resources", defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
+@Mojo(name = "resources", threadSafe = true, defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
 public class Native2AsciiMojo extends AbstractNative2AsciiMojo {
 
   /**
diff --git a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiTestMojo.java b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiTestMojo.java
index 5f9261b..8aa7b7a 100644
--- a/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiTestMojo.java
+++ b/src/main/java/org/codehaus/mojo/native2ascii/mojo/Native2AsciiTestMojo.java
@@ -28,7 +28,7 @@
  *
  * @author David Matějček
  */
-@Mojo(name = "testResources", defaultPhase = LifecyclePhase.PROCESS_TEST_RESOURCES)
+@Mojo(name = "testResources", threadSafe = true, defaultPhase = LifecyclePhase.PROCESS_TEST_RESOURCES)
 public class Native2AsciiTestMojo extends Native2AsciiMojo {
 
   /**