diff --git a/source/common/common/base64.cc b/source/common/common/base64.cc
index ea215b85b9ee9..fc4cd599c20d3 100644
--- a/source/common/common/base64.cc
+++ b/source/common/common/base64.cc
@@ -234,13 +234,6 @@ std::string Base64::encode(const char* input, uint64_t length, bool add_padding)
   return ret;
 }
 
-void Base64::completePadding(std::string& encoded) {
-  if (encoded.length() % 4 != 0) {
-    std::string trailing_padding(4 - encoded.length() % 4, '=');
-    encoded.append(trailing_padding);
-  }
-}
-
 std::string Base64Url::decode(const std::string& input) {
   if (input.empty()) {
     return EMPTY_STRING;
diff --git a/source/common/common/base64.h b/source/common/common/base64.h
index a69ffbf910a3b..13beff40b64ab 100644
--- a/source/common/common/base64.h
+++ b/source/common/common/base64.h
@@ -54,12 +54,6 @@ class Base64 {
    * bytes.
    */
   static std::string decodeWithoutPadding(absl::string_view input);
-
-  /**
-   * Add the padding in the base64 encoded binary if the padding is missing.
-   * @param encoded is the target to complete the padding.
-   */
-  static void completePadding(std::string& encoded);
 };
 
 /**
diff --git a/source/extensions/filters/http/jwt_authn/authenticator.cc b/source/extensions/filters/http/jwt_authn/authenticator.cc
index ff30bf5760ea1..0115e91d061b6 100644
--- a/source/extensions/filters/http/jwt_authn/authenticator.cc
+++ b/source/extensions/filters/http/jwt_authn/authenticator.cc
@@ -3,7 +3,6 @@
 #include "envoy/http/async_client.h"
 
 #include "common/common/assert.h"
-#include "common/common/base64.h"
 #include "common/common/enum_to_int.h"
 #include "common/common/logger.h"
 #include "common/http/message_impl.h"
@@ -249,12 +248,9 @@ void AuthenticatorImpl::verifyKey() {
 
   // Forward the payload
   const auto& provider = jwks_data_->getJwtProvider();
-
   if (!provider.forward_payload_header().empty()) {
-    std::string payload_with_padding = jwt_->payload_str_base64url_;
-    Base64::completePadding(payload_with_padding);
     headers_->addCopy(Http::LowerCaseString(provider.forward_payload_header()),
-                      payload_with_padding);
+                      jwt_->payload_str_base64url_);
   }
 
   if (!provider.forward()) {
diff --git a/test/common/common/base64_test.cc b/test/common/common/base64_test.cc
index ff9382191e896..04ad1dfb24b9e 100644
--- a/test/common/common/base64_test.cc
+++ b/test/common/common/base64_test.cc
@@ -132,47 +132,6 @@ TEST(Base64Test, BinaryBufferEncode) {
   EXPECT_EQ("AAECAwgKCQCqvN4=", Base64::encode(buffer, 30));
 }
 
-TEST(Base64Test, CompletePadding) {
-  struct CompletePaddingBase64UrlTestCases {
-    std::string base64, base64_with_padding;
-  };
-
-  // For base64 encoding, there are only three length needed to test
-  // - 3n bytes => 4n bytes, no padding needed
-  // - 3n + 1 bytes => 4n + 2 bytes, 2 padding needed
-  // - 3n + 2 bytes => 4n + 3 bytes, 1 padding needed
-  CompletePaddingBase64UrlTestCases testCases[3] = {
-      // Payload text(3n bytes):
-      {"eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG8iLCJpYXQiOjE1MTYyMzkwMjJ"
-       "9",
-       // No padding added.
-       "eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG8iLCJpYXQiOjE1MTYyMzkwMjJ"
-       "9"},
-      // Payload text(3n + 1 bytes):
-      {"eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2"
-       "MjM5MDIyfQ",
-       // 2 padding added.
-       "eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2"
-       "MjM5MDIyfQ=="},
-      // Payload text(3n + 2 bytes):
-      {"eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lZSIsImlhdCI6MTUx"
-       "NjIzOTAyMn0",
-       // 1 padding added.
-       "eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lZSIsImlhdCI6MTUx"
-       "NjIzOTAyMn0="}};
-  for (auto& tc : testCases) {
-    // Ensure these two base64 binaries are equivalent after decoding.
-    EXPECT_EQ(Base64::decodeWithoutPadding(tc.base64),
-              Base64::decodeWithoutPadding(tc.base64_with_padding));
-    // Ensure the `base64_with_padding` is correctly padded.
-    EXPECT_NE(Base64::decode(tc.base64_with_padding), "");
-
-    std::string base64_padded = tc.base64;
-    Base64::completePadding(base64_padded);
-    EXPECT_EQ(base64_padded, tc.base64_with_padding);
-  }
-}
-
 TEST(Base64UrlTest, EncodeString) {
   EXPECT_EQ("", Base64Url::encode("", 0));
   EXPECT_EQ("AAA", Base64Url::encode("\0\0", 2));
diff --git a/test/extensions/filters/http/jwt_authn/BUILD b/test/extensions/filters/http/jwt_authn/BUILD
index d972cc18fc0e6..176ebaa445f8d 100644
--- a/test/extensions/filters/http/jwt_authn/BUILD
+++ b/test/extensions/filters/http/jwt_authn/BUILD
@@ -101,7 +101,6 @@ envoy_extension_cc_test(
     extension_name = "envoy.filters.http.jwt_authn",
     deps = [
         ":mock_lib",
-        "//source/common/common:base64_lib",
         "//source/extensions/filters/http/common:jwks_fetcher_lib",
         "//source/extensions/filters/http/jwt_authn:authenticator_lib",
         "//source/extensions/filters/http/jwt_authn:filter_config_interface",
diff --git a/test/extensions/filters/http/jwt_authn/test_common.h b/test/extensions/filters/http/jwt_authn/test_common.h
index b8e070c426854..0f2478ee2a73b 100644
--- a/test/extensions/filters/http/jwt_authn/test_common.h
+++ b/test/extensions/filters/http/jwt_authn/test_common.h
@@ -176,7 +176,7 @@ const char OtherGoodToken[] =
 // Expected base64 payload value.
 const char ExpectedPayloadValue[] = "eyJpc3MiOiJodHRwczovL2V4YW1wbGUuY29tIiwic3ViIjoidGVzdEBleGFtcG"
                                     "xlLmNvbSIsImV4cCI6MjAwMTAwMTAwMSwiYXVkIjoiZXhhbXBsZV9zZXJ2"
-                                    "aWNlIn0=";
+                                    "aWNlIn0";
 
 // Base64 decoded Payload JSON
 const char ExpectedPayloadJSON[] = R"(