diff --git a/analysis_options.yaml b/analysis_options.yaml
index 50b1b8fc..ac173063 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -13,6 +13,7 @@ linter:
     - omit_local_variable_types
     - prefer_const_constructors
     - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
     - prefer_final_fields
     - prefer_final_in_for_each
     - prefer_final_locals
diff --git a/lib/models/documents/style.dart b/lib/models/documents/style.dart
index 4becc57e..37f6a0b9 100644
--- a/lib/models/documents/style.dart
+++ b/lib/models/documents/style.dart
@@ -95,7 +95,7 @@ class Style {
       return false;
     }
     final typedOther = other;
-    final eq = const MapEquality<String, Attribute>();
+    const eq = MapEquality<String, Attribute>();
     return eq.equals(_attributes, typedOther._attributes);
   }
 
diff --git a/lib/models/quill_delta.dart b/lib/models/quill_delta.dart
index c8707ee0..0135bd6a 100644
--- a/lib/models/quill_delta.dart
+++ b/lib/models/quill_delta.dart
@@ -293,8 +293,7 @@ class Delta {
     if (identical(this, other)) return true;
     if (other is! Delta) return false;
     final typedOther = other;
-    final comparator =
-        const ListEquality<Operation>(DefaultEquality<Operation>());
+    const comparator = ListEquality<Operation>(DefaultEquality<Operation>());
     return comparator.equals(_operations, typedOther._operations);
   }
 
diff --git a/lib/widgets/default_styles.dart b/lib/widgets/default_styles.dart
index 7f908114..2f2ea02c 100644
--- a/lib/widgets/default_styles.dart
+++ b/lib/widgets/default_styles.dart
@@ -90,7 +90,7 @@ class DefaultStyles {
       fontSize: 16.0,
       height: 1.3,
     );
-    final baseSpacing = const Tuple2<double, double>(6.0, 0);
+    const baseSpacing = Tuple2<double, double>(6.0, 0);
     String fontFamily;
     switch (themeData.platform) {
       case TargetPlatform.iOS: