diff --git a/hl7templates/hl7templates-packager-jar/src/main/java/net/ihe/gazelle/lib/hl7templatespackager/peripherals/HL7Templates2GOC.java b/hl7templates/hl7templates-packager-jar/src/main/java/net/ihe/gazelle/lib/hl7templatespackager/peripherals/HL7Templates2GOC.java
index 5c744d9bb1c7c51d467b6bb6ccea661279cabaeb..5cc9e0f14a8ca0ab4aaa2b3fed3892728881eb36 100644
--- a/hl7templates/hl7templates-packager-jar/src/main/java/net/ihe/gazelle/lib/hl7templatespackager/peripherals/HL7Templates2GOC.java
+++ b/hl7templates/hl7templates-packager-jar/src/main/java/net/ihe/gazelle/lib/hl7templatespackager/peripherals/HL7Templates2GOC.java
@@ -19,7 +19,7 @@ public class HL7Templates2GOC implements GOCEntry {
     @Option(name = "-serviceName", metaVar = "serviceName", usage = "Validation Service Name", required = false)
     private String serviceName;
 
-    @Option(name = "-mvn", metaVar = "mvn", usage = "maven executable path", required = false)
+    @Option(name = "-mvn", metaVar = "mvn", usage = "maven executable path", required = true)
     private String mvnExecPath = "mvn";
 
     @Option(name = "-ignoreTemplateIdRequirements", usage = "ignore TemplateId Requirements when generating the constraints (useful for C-CDA " +