diff --git a/source/extensions/tracers/opencensus/config.cc b/source/extensions/tracers/opencensus/config.cc
index ec0e766e532d..caafc23a28ee 100644
--- a/source/extensions/tracers/opencensus/config.cc
+++ b/source/extensions/tracers/opencensus/config.cc
@@ -16,7 +16,8 @@ OpenCensusTracerFactory::OpenCensusTracerFactory() : FactoryBase(TracerNames::ge
 
 Tracing::HttpTracerPtr OpenCensusTracerFactory::createHttpTracerTyped(
     const envoy::config::trace::v2::OpenCensusConfig& proto_config, Server::Instance& server) {
-  Tracing::DriverPtr driver = std::make_unique<Driver>(proto_config, server.localInfo());
+  Tracing::DriverPtr driver =
+      std::make_unique<Driver>(proto_config, server.localInfo(), server.api());
   return std::make_unique<Tracing::HttpTracerImpl>(std::move(driver), server.localInfo());
 }
 
diff --git a/source/extensions/tracers/opencensus/opencensus_tracer_impl.cc b/source/extensions/tracers/opencensus/opencensus_tracer_impl.cc
index 0a954eedeaf0..b604b9f457a0 100644
--- a/source/extensions/tracers/opencensus/opencensus_tracer_impl.cc
+++ b/source/extensions/tracers/opencensus/opencensus_tracer_impl.cc
@@ -235,7 +235,7 @@ void Span::setSampled(bool sampled) { span_.AddAnnotation("setSampled", {{"sampl
 } // namespace
 
 Driver::Driver(const envoy::config::trace::v2::OpenCensusConfig& oc_config,
-               const LocalInfo::LocalInfo& localinfo)
+               const LocalInfo::LocalInfo& localinfo, Api::Api& api)
     : oc_config_(oc_config), local_info_(localinfo) {
   if (oc_config.has_trace_config()) {
     applyTraceConfig(oc_config.trace_config());
@@ -264,7 +264,8 @@ Driver::Driver(const envoy::config::trace::v2::OpenCensusConfig& oc_config,
       sts_options.scope = "https://www.googleapis.com/auth/cloud-platform";
       auto call_creds = grpc::experimental::StsCredentials(sts_options);
       auto ssl_creds_options = grpc::SslCredentialsOptions();
-      ssl_creds_options.pem_root_certs = "/etc/ssl/certs/ca-certificates.crt";
+      ssl_creds_options.pem_root_certs =
+          api.fileSystem().fileReadToEnd("/etc/ssl/certs/ca-certificates.crt");
       auto channel_creds = grpc::SslCredentials(ssl_creds_options);
       auto channel =
           ::grpc::CreateChannel("cloudtrace.googleapis.com",
diff --git a/source/extensions/tracers/opencensus/opencensus_tracer_impl.h b/source/extensions/tracers/opencensus/opencensus_tracer_impl.h
index 1b334e928172..d2aeadbf6b50 100644
--- a/source/extensions/tracers/opencensus/opencensus_tracer_impl.h
+++ b/source/extensions/tracers/opencensus/opencensus_tracer_impl.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "envoy/api/api.h"
 #include "envoy/config/trace/v2/trace.pb.validate.h"
 #include "envoy/local_info/local_info.h"
 #include "envoy/tracing/http_tracer.h"
@@ -17,7 +18,7 @@ namespace OpenCensus {
 class Driver : public Tracing::Driver, Logger::Loggable<Logger::Id::tracing> {
 public:
   Driver(const envoy::config::trace::v2::OpenCensusConfig& oc_config,
-         const LocalInfo::LocalInfo& localinfo);
+         const LocalInfo::LocalInfo& localinfo, Api::Api& api);
 
   /**
    * Implements the abstract Driver's startSpan operation.
diff --git a/test/extensions/filters/common/expr/context_test.cc b/test/extensions/filters/common/expr/context_test.cc
index 75971170c0de..d982a0918687 100644
--- a/test/extensions/filters/common/expr/context_test.cc
+++ b/test/extensions/filters/common/expr/context_test.cc
@@ -239,7 +239,6 @@ TEST(Context, ResponseAttributes) {
     EXPECT_EQ(148, value.value().Int64OrDie());
   }
 
-
   {
     auto value = empty_response[CelValue::CreateString(TotalSize)];
     EXPECT_TRUE(value.has_value());