diff --git a/json_serializable/CHANGELOG.md b/json_serializable/CHANGELOG.md
index 0fd1ed5e5..d4e683d06 100644
--- a/json_serializable/CHANGELOG.md
+++ b/json_serializable/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.6.1
+
+- Fix bug when `JsonKey.includeToJson` is `false`.
+
 ## 6.6.0
 
 - Support for `JsonKey.includeFromJson` and `JsonKey.includeToJson`.
diff --git a/json_serializable/lib/src/generator_helper.dart b/json_serializable/lib/src/generator_helper.dart
index 1b8621156..501df9469 100644
--- a/json_serializable/lib/src/generator_helper.dart
+++ b/json_serializable/lib/src/generator_helper.dart
@@ -151,5 +151,5 @@ extension on KeyConfig {
 
   bool get explicitYesToJson => includeToJson == true;
 
-  bool get explicitNoToJson => includeFromJson == false;
+  bool get explicitNoToJson => includeToJson == false;
 }
diff --git a/json_serializable/pubspec.yaml b/json_serializable/pubspec.yaml
index 0807ca23f..678000181 100644
--- a/json_serializable/pubspec.yaml
+++ b/json_serializable/pubspec.yaml
@@ -1,5 +1,5 @@
 name: json_serializable
-version: 6.6.0
+version: 6.6.1
 description: >-
   Automatically generate code for converting to and from JSON by annotating
   Dart classes.
diff --git a/json_serializable/test/field_matrix_test.dart b/json_serializable/test/field_matrix_test.dart
index 0e18091f9..8f1abff1a 100644
--- a/json_serializable/test/field_matrix_test.dart
+++ b/json_serializable/test/field_matrix_test.dart
@@ -40,16 +40,16 @@ const _expectedResult = {
     'without': {'aField': null, 'field': null, 'zField': null}
   },
   'ToJsonTrueFromJsonFalsePublic: field: null': {
-    'with': {'aField': null, 'zField': null},
-    'without': {'aField': null, 'zField': null}
+    'with': {'aField': null, 'field': null, 'zField': null},
+    'without': {'aField': null, 'field': null, 'zField': null}
   },
   'ToJsonFalseFromJsonNullPublic: field: 42': {
-    'with': {'aField': null, 'field': 42, 'zField': null},
-    'without': {'aField': null, 'field': null, 'zField': null}
+    'with': {'aField': null, 'zField': null},
+    'without': {'aField': null, 'zField': null}
   },
   'ToJsonFalseFromJsonTruePublic: field: 42': {
-    'with': {'aField': null, 'field': 42, 'zField': null},
-    'without': {'aField': null, 'field': null, 'zField': null}
+    'with': {'aField': null, 'zField': null},
+    'without': {'aField': null, 'zField': null}
   },
   'ToJsonFalseFromJsonFalsePublic: field: null': {
     'with': {'aField': null, 'zField': null},
@@ -76,16 +76,16 @@ const _expectedResult = {
     'without': {'aField': null, 'field': null, 'zField': null}
   },
   'ToJsonTrueFromJsonFalsePrivate: _field: null': {
-    'with': {'aField': null, 'zField': null},
-    'without': {'aField': null, 'zField': null}
+    'with': {'aField': null, 'field': null, 'zField': null},
+    'without': {'aField': null, 'field': null, 'zField': null}
   },
   'ToJsonFalseFromJsonNullPrivate: _field: null': {
     'with': {'aField': null, 'zField': null},
     'without': {'aField': null, 'zField': null}
   },
   'ToJsonFalseFromJsonTruePrivate: _field: 42': {
-    'with': {'aField': null, 'field': 42, 'zField': null},
-    'without': {'aField': null, 'field': null, 'zField': null}
+    'with': {'aField': null, 'zField': null},
+    'without': {'aField': null, 'zField': null}
   },
   'ToJsonFalseFromJsonFalsePrivate: _field: null': {
     'with': {'aField': null, 'zField': null},
diff --git a/json_serializable/test/field_matrix_test.field_matrix.g.dart b/json_serializable/test/field_matrix_test.field_matrix.g.dart
index dd948315f..cdb054b03 100644
--- a/json_serializable/test/field_matrix_test.field_matrix.g.dart
+++ b/json_serializable/test/field_matrix_test.field_matrix.g.dart
@@ -91,6 +91,7 @@ Map<String, dynamic> _$ToJsonTrueFromJsonFalsePublicToJson(
         ToJsonTrueFromJsonFalsePublic instance) =>
     <String, dynamic>{
       'aField': instance.aField,
+      'field': instance.field,
       'zField': instance.zField,
     };
 
@@ -105,7 +106,6 @@ Map<String, dynamic> _$ToJsonFalseFromJsonNullPublicToJson(
         ToJsonFalseFromJsonNullPublic instance) =>
     <String, dynamic>{
       'aField': instance.aField,
-      'field': instance.field,
       'zField': instance.zField,
     };
 
@@ -120,7 +120,6 @@ Map<String, dynamic> _$ToJsonFalseFromJsonTruePublicToJson(
         ToJsonFalseFromJsonTruePublic instance) =>
     <String, dynamic>{
       'aField': instance.aField,
-      'field': instance.field,
       'zField': instance.zField,
     };
 
@@ -217,6 +216,7 @@ Map<String, dynamic> _$ToJsonTrueFromJsonFalsePrivateToJson(
         ToJsonTrueFromJsonFalsePrivate instance) =>
     <String, dynamic>{
       'aField': instance.aField,
+      'field': instance._field,
       'zField': instance.zField,
     };
 
@@ -244,7 +244,6 @@ Map<String, dynamic> _$ToJsonFalseFromJsonTruePrivateToJson(
         ToJsonFalseFromJsonTruePrivate instance) =>
     <String, dynamic>{
       'aField': instance.aField,
-      'field': instance._field,
       'zField': instance.zField,
     };