diff --git a/test/BUILD.gn b/test/BUILD.gn
index c89085d542..18f680402d 100644
--- a/test/BUILD.gn
+++ b/test/BUILD.gn
@@ -220,7 +220,10 @@ rtc_library("field_trial") {
     "field_trial.h",
   ]
 
-  deps = [ "../system_wrappers:field_trial" ]
+  deps = [
+    "../rtc_base:checks",
+    "../system_wrappers:field_trial",
+  ]
 }
 
 rtc_library("explicit_key_value_config") {
diff --git a/test/field_trial.cc b/test/field_trial.cc
index c40fcc36c1..96842012c6 100644
--- a/test/field_trial.cc
+++ b/test/field_trial.cc
@@ -16,6 +16,7 @@
 #include <map>
 #include <string>
 
+#include "rtc_base/checks.h"
 #include "system_wrappers/include/field_trial.h"
 
 namespace webrtc {
@@ -24,11 +25,16 @@ void ValidateFieldTrialsStringOrDie(const std::string&) {}
 
 ScopedFieldTrials::ScopedFieldTrials(const std::string& config)
     : previous_field_trials_(webrtc::field_trial::GetFieldTrialString()) {
+  RTC_CHECK(webrtc::field_trial::FieldTrialsStringIsValid(config.c_str()))
+      << "Invalid field trials string: " << config;
   current_field_trials_ = config;
   webrtc::field_trial::InitFieldTrialsFromString(current_field_trials_.c_str());
 }
 
 ScopedFieldTrials::~ScopedFieldTrials() {
+  RTC_CHECK(
+      webrtc::field_trial::FieldTrialsStringIsValid(previous_field_trials_))
+      << "Invalid field trials string: " << previous_field_trials_;
   webrtc::field_trial::InitFieldTrialsFromString(previous_field_trials_);
 }