diff --git a/modules/caddyhttp/tracing/tracer.go b/modules/caddyhttp/tracing/tracer.go
index 89c617bf4..2fbc15cab 100644
--- a/modules/caddyhttp/tracing/tracer.go
+++ b/modules/caddyhttp/tracing/tracer.go
@@ -88,11 +88,15 @@ func (ot *openTelemetryWrapper) serveHTTP(w http.ResponseWriter, r *http.Request
 	spanCtx := trace.SpanContextFromContext(ctx)
 	if spanCtx.IsValid() {
 		traceID := spanCtx.TraceID().String()
+		spanID := spanCtx.SpanID().String()
 		// Add a trace_id placeholder, accessible via `{http.vars.trace_id}`.
 		caddyhttp.SetVar(ctx, "trace_id", traceID)
+		// Add a span_id placeholder, accessible via `{http.vars.span_id}`.
+		caddyhttp.SetVar(ctx, "span_ud", spanID)
 		// Add the trace id to the log fields for the request.
 		if extra, ok := ctx.Value(caddyhttp.ExtraLogFieldsCtxKey).(*caddyhttp.ExtraLogFields); ok {
 			extra.Add(zap.String("traceID", traceID))
+			extra.Add(zap.String("spanID", spanID))
 		}
 	}
 	next := ctx.Value(nextCallCtxKey).(*nextCall)