diff --git a/helm/templates/mapproxinator/mapproxinator-configmap.yaml b/helm/templates/mapproxinator/mapproxinator-configmap.yaml
index 753c8a5..6b5fb85 100644
--- a/helm/templates/mapproxinator/mapproxinator-configmap.yaml
+++ b/helm/templates/mapproxinator/mapproxinator-configmap.yaml
@@ -24,7 +24,7 @@ data:
   LOG_PRETTY_PRINT_ENABLED: {{ .Values.mapproxinator.env.logPrettyPrintEnabled | quote }}
   {{ if $tracing.enabled }}
   TELEMETRY_TRACING_ENABLED: 'true'
-  TELEMETRY_TRACING_URL: {{ $tracing.url }}
+  TELEMETRY_TRACING_URL: {{ .Values.mapproxinator.tracing.url | default $tracing.url }}
   {{ end }}
   {{ if $metrics.enabled }}
   TELEMETRY_METRICS_ENABLED: 'true'
diff --git a/helm/values.yaml b/helm/values.yaml
index a9fb67d..63bc3db 100644
--- a/helm/values.yaml
+++ b/helm/values.yaml
@@ -388,6 +388,14 @@ nginx:
 mapproxinator:
   enabled: true
   replicaCount: 1
+  tracing:
+    # The mapproxinator app exports OTLP over HTTP (@map-colonies/telemetry ->
+    # @opentelemetry/exporter-trace-otlp-proto), while the mapproxy container
+    # exports OTLP over gRPC. When the collector serves those on different ports
+    # the shared `tracing.url` cannot satisfy both, so set the HTTP endpoint here,
+    # e.g. "http://otel-collector:4318/v1/traces".
+    # Empty means inherit the shared tracing.url.
+    url: ""
   image:
     repository: mapproxinator
     tag: "latest"