diff --git a/system_wrappers/include/field_trial.h b/system_wrappers/include/field_trial.h
index 52db33b0e9..48bad41d5c 100644
--- a/system_wrappers/include/field_trial.h
+++ b/system_wrappers/include/field_trial.h
@@ -84,7 +84,6 @@ void InitFieldTrialsFromString(const char* trials_string);
 
 const char* GetFieldTrialString();
 
-#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
 // Validates the given field trial string.
 bool FieldTrialsStringIsValid(const char* trials_string);
 
@@ -94,7 +93,6 @@ bool FieldTrialsStringIsValid(const char* trials_string);
 // in 'second' takes precedence.
 // Shall only be called with valid FieldTrial strings.
 std::string MergeFieldTrialsStrings(const char* first, const char* second);
-#endif  // WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
 
 }  // namespace field_trial
 }  // namespace webrtc
diff --git a/system_wrappers/source/field_trial.cc b/system_wrappers/source/field_trial.cc
index d16ea7e03f..8e447907d7 100644
--- a/system_wrappers/source/field_trial.cc
+++ b/system_wrappers/source/field_trial.cc
@@ -26,7 +26,6 @@ namespace field_trial {
 
 static const char* trials_init_string = NULL;
 
-#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
 namespace {
 constexpr char kPersistentStringSeparator = '/';
 // Validates the given field trial string.
@@ -102,6 +101,7 @@ std::string MergeFieldTrialsStrings(const char* first, const char* second) {
   return merged;
 }
 
+#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
 std::string FindFullName(const std::string& name) {
   if (trials_init_string == NULL)
     return std::string();
@@ -138,12 +138,10 @@ std::string FindFullName(const std::string& name) {
 // Optionally initialize field trial from a string.
 void InitFieldTrialsFromString(const char* trials_string) {
   RTC_LOG(LS_INFO) << "Setting field trial string:" << trials_string;
-#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
   if (trials_string) {
     RTC_DCHECK(FieldTrialsStringIsValidInternal(trials_string))
         << "Invalid field trials string:" << trials_string;
   };
-#endif  // WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
   trials_init_string = trials_string;
 }