diff --git a/api/envoy/config/core/v3/substitution_format_string.proto b/api/envoy/config/core/v3/substitution_format_string.proto
index 4f3688672482c..b4383c1eb939d 100644
--- a/api/envoy/config/core/v3/substitution_format_string.proto
+++ b/api/envoy/config/core/v3/substitution_format_string.proto
@@ -36,7 +36,7 @@ message SubstitutionFormatString {
     //
     //   upstream connect error:204:path=/foo
     //
-    string text_format = 1 [(validate.rules).string = {min_bytes: 1}];
+    string text_format = 1;
 
     // Specify a format with command operators to form a JSON string.
     // Its details is described in :ref:`format dictionary<config_access_log_format_dictionaries>`.
diff --git a/api/envoy/config/core/v4alpha/substitution_format_string.proto b/api/envoy/config/core/v4alpha/substitution_format_string.proto
index 2bb2d5e0ed317..1edc3e00e9f80 100644
--- a/api/envoy/config/core/v4alpha/substitution_format_string.proto
+++ b/api/envoy/config/core/v4alpha/substitution_format_string.proto
@@ -40,7 +40,7 @@ message SubstitutionFormatString {
     //
     //   upstream connect error:204:path=/foo
     //
-    string text_format = 1 [(validate.rules).string = {min_bytes: 1}];
+    string text_format = 1;
 
     // Specify a format with command operators to form a JSON string.
     // Its details is described in :ref:`format dictionary<config_access_log_format_dictionaries>`.
diff --git a/generated_api_shadow/envoy/config/core/v3/substitution_format_string.proto b/generated_api_shadow/envoy/config/core/v3/substitution_format_string.proto
index 4f3688672482c..b4383c1eb939d 100644
--- a/generated_api_shadow/envoy/config/core/v3/substitution_format_string.proto
+++ b/generated_api_shadow/envoy/config/core/v3/substitution_format_string.proto
@@ -36,7 +36,7 @@ message SubstitutionFormatString {
     //
     //   upstream connect error:204:path=/foo
     //
-    string text_format = 1 [(validate.rules).string = {min_bytes: 1}];
+    string text_format = 1;
 
     // Specify a format with command operators to form a JSON string.
     // Its details is described in :ref:`format dictionary<config_access_log_format_dictionaries>`.
diff --git a/generated_api_shadow/envoy/config/core/v4alpha/substitution_format_string.proto b/generated_api_shadow/envoy/config/core/v4alpha/substitution_format_string.proto
index 2bb2d5e0ed317..1edc3e00e9f80 100644
--- a/generated_api_shadow/envoy/config/core/v4alpha/substitution_format_string.proto
+++ b/generated_api_shadow/envoy/config/core/v4alpha/substitution_format_string.proto
@@ -40,7 +40,7 @@ message SubstitutionFormatString {
     //
     //   upstream connect error:204:path=/foo
     //
-    string text_format = 1 [(validate.rules).string = {min_bytes: 1}];
+    string text_format = 1;
 
     // Specify a format with command operators to form a JSON string.
     // Its details is described in :ref:`format dictionary<config_access_log_format_dictionaries>`.