diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19dd13a70..bacee02ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 - [#876](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/876) Use native String#end_with
 - [#873](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/873) Various fixes to get the tests running for Rails 6.1
 - [#874](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/874) Deduplicate schema cache structures
+- [#875](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/875) Handle default boolean column values when deduplicating
 
 #### Changed
 
diff --git a/lib/active_record/connection_adapters/sqlserver_column.rb b/lib/active_record/connection_adapters/sqlserver_column.rb
index b03e8e7e4..acd2c40ef 100644
--- a/lib/active_record/connection_adapters/sqlserver_column.rb
+++ b/lib/active_record/connection_adapters/sqlserver_column.rb
@@ -27,6 +27,22 @@ def is_utf8?
       def case_sensitive?
         collation && collation.match(/_CS/)
       end
+
+      private
+
+      # Handle when the default value is a boolean. Boolean's do not respond to the method `:-@`. Method now
+      # checks whether the default value is already frozen and if so it uses that, otherwise it calls `:-@` to
+      # freeze it.
+      def deduplicated
+        @name = -name
+        @sql_type_metadata = sql_type_metadata.deduplicate if sql_type_metadata
+        @default = (default.frozen? ? default : -default) if default
+        @default_function = -default_function if default_function
+        @collation = -collation if collation
+        @comment = -comment if comment
+
+        freeze
+      end
     end
   end
 end