diff --git a/logging/rtc_event_log/encoder/delta_encoding.cc b/logging/rtc_event_log/encoder/delta_encoding.cc
index 80fb5879d9..914b0ca8aa 100644
--- a/logging/rtc_event_log/encoder/delta_encoding.cc
+++ b/logging/rtc_event_log/encoder/delta_encoding.cc
@@ -116,7 +116,6 @@ class FixedLengthEncodingParameters final {
  public:
   static bool ValidParameters(uint64_t delta_width_bits,
                               bool signed_deltas,
-                              bool values_optional,
                               uint64_t value_width_bits) {
     return (1 <= delta_width_bits && delta_width_bits <= 64 &&
             1 <= value_width_bits && value_width_bits <= 64 &&
@@ -133,8 +132,8 @@ class FixedLengthEncodingParameters final {
         value_width_bits_(value_width_bits),
         delta_mask_(MaxUnsignedValueOfBitWidth(delta_width_bits_)),
         value_mask_(MaxUnsignedValueOfBitWidth(value_width_bits_)) {
-    RTC_DCHECK(ValidParameters(delta_width_bits, signed_deltas, values_optional,
-                               value_width_bits));
+    RTC_DCHECK(
+        ValidParameters(delta_width_bits, signed_deltas, value_width_bits));
   }
 
   // Number of bits necessary to hold the widest(*) of the deltas between the
@@ -701,7 +700,7 @@ std::unique_ptr<FixedLengthDeltaDecoder> FixedLengthDeltaDecoder::Create(
   // for illegal values to be read. We check nevertheless, in case the code
   // changes in the future in a way that breaks this promise.
   if (!FixedLengthEncodingParameters::ValidParameters(
-          delta_width_bits, signed_deltas, values_optional, value_width_bits)) {
+          delta_width_bits, signed_deltas, value_width_bits)) {
     RTC_LOG(LS_WARNING) << "Corrupt log; illegal encoding parameters.";
     return nullptr;
   }
diff --git a/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.cc b/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.cc
index 166dedd6e4..037afa8e81 100644
--- a/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.cc
+++ b/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.cc
@@ -91,8 +91,8 @@ FixedLengthEncodingParametersV3::CalculateParameters(
   // equal".
   RTC_DCHECK(!use_signed_deltas || delta_bit_width < 64);
 
-  RTC_DCHECK(ValidParameters(delta_bit_width, use_signed_deltas,
-                             values_optional, value_bit_width));
+  RTC_DCHECK(
+      ValidParameters(delta_bit_width, use_signed_deltas, value_bit_width));
   return FixedLengthEncodingParametersV3(delta_bit_width, use_signed_deltas,
                                          values_optional, value_bit_width);
 }
@@ -122,8 +122,7 @@ FixedLengthEncodingParametersV3::ParseDeltaHeader(uint64_t header,
     return std::nullopt;
   }
 
-  if (!ValidParameters(delta_bit_width, signed_deltas, values_optional,
-                       value_bit_width)) {
+  if (!ValidParameters(delta_bit_width, signed_deltas, value_bit_width)) {
     RTC_LOG(LS_ERROR) << "Failed to parse delta header. Invalid combination of "
                          "values: delta_bit_width="
                       << delta_bit_width << " signed_deltas=" << signed_deltas
diff --git a/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.h b/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.h
index 3640b20edb..c93d9b3dd2 100644
--- a/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.h
+++ b/logging/rtc_event_log/events/fixed_length_encoding_parameters_v3.h
@@ -25,7 +25,6 @@ class FixedLengthEncodingParametersV3 final {
  public:
   static bool ValidParameters(uint64_t delta_bit_width,
                               bool signed_deltas,
-                              bool values_optional,
                               uint64_t value_bit_width) {
     return (1 <= delta_bit_width && delta_bit_width <= 64 &&
             1 <= value_bit_width && value_bit_width <= 64 &&