diff --git a/conf/us-common.config b/conf/us-common.config
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+++ b/conf/us-common.config
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+% This a test configuration file for the Traces layer, in the context of
+% US-Common.
+
+[
+
+  % Settings for the 'traces' application:
+  { traces, [
+
+		% As we want each US-* application to be autonomous from the others,
+		% hence to rely on its own trace aggregator:
+		%
+		{ trace_aggregator_registration_scope, local_only }
+
+			] }
+
+].