diff --git a/backend/src/test/java/de/fete/HexagonalArchitectureTest.java b/backend/src/test/java/de/fete/HexagonalArchitectureTest.java
index fbcba99..90e2124 100644
--- a/backend/src/test/java/de/fete/HexagonalArchitectureTest.java
+++ b/backend/src/test/java/de/fete/HexagonalArchitectureTest.java
@@ -60,4 +60,9 @@ class HexagonalArchitectureTest {
   static final ArchRule persistenceMustNotDependOnWeb = noClasses()
       .that().resideInAPackage("de.fete.adapter.out.persistence..")
       .should().dependOnClassesThat().resideInAPackage("de.fete.adapter.in.web..");
+
+  @ArchTest
+  static final ArchRule webAdapterMustNotDependOnOutboundPorts = noClasses()
+      .that().resideInAPackage("de.fete.adapter.in.web..")
+      .should().dependOnClassesThat().resideInAPackage("de.fete.domain.port.out..");
 }