diff --git a/src/test/java/rcms/utilities/daqaggregator/TestWithExternalSystem.java b/src/test/java/rcms/utilities/daqaggregator/TestWithExternalSystem.java
new file mode 100644
index 00000000..53877a65
--- /dev/null
+++ b/src/test/java/rcms/utilities/daqaggregator/TestWithExternalSystem.java
@@ -0,0 +1,9 @@
+package rcms.utilities.daqaggregator;
+
+/**
+ * Marker for JUnit tests which need the presence of an external system
+ * and should therefore not be run during release building.
+ */
+public interface TestWithExternalSystem {
+	
+}