diff --git a/blossom-reference-generator/src/main/java/com/merkle/oss/magnolia/renderer/handlebars/generator/reference/ReferenceGeneratorMojo.java b/blossom-reference-generator/src/main/java/com/merkle/oss/magnolia/renderer/handlebars/generator/reference/ReferenceGeneratorMojo.java
index 946b2f2..a451ac2 100644
--- a/blossom-reference-generator/src/main/java/com/merkle/oss/magnolia/renderer/handlebars/generator/reference/ReferenceGeneratorMojo.java
+++ b/blossom-reference-generator/src/main/java/com/merkle/oss/magnolia/renderer/handlebars/generator/reference/ReferenceGeneratorMojo.java
@@ -9,7 +9,7 @@
 import java.util.Set;
 
 
-@Mojo(name = "reference-generator", defaultPhase = LifecyclePhase.GENERATE_SOURCES)
+@Mojo(name = "reference-generator", defaultPhase = LifecyclePhase.GENERATE_SOURCES, threadSafe = true)
 public class ReferenceGeneratorMojo extends AbstractMojo {
 	@Parameter(property = "packageName", required = true)
 	private String packageName;