diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
index 0eff3131b6e76..0871aabf8a4e5 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb
@@ -53,7 +53,9 @@ def schema_limit(column)
           end
 
           def schema_precision(column)
-            super unless /\A(?:date)?time(?:stamp)?\b/.match?(column.sql_type) && column.precision == 0
+            return if /\Adatetime\b/.match(column.sql_type) && column.precision == 6
+            return if /\Atime(?:stamp)?\b/.match?(column.sql_type) && column.precision == 0
+            super
           end
 
           def schema_collation(column)
diff --git a/activerecord/test/cases/date_time_precision_test.rb b/activerecord/test/cases/date_time_precision_test.rb
index 67304b392324d..f86945117a13e 100644
--- a/activerecord/test/cases/date_time_precision_test.rb
+++ b/activerecord/test/cases/date_time_precision_test.rb
@@ -193,13 +193,15 @@ def test_writing_a_blank_attribute_timestamptz
       end
     end
 
-    def test_schema_dump_includes_datetime_precision
+    def test_schema_dump_includes_non_default_datetime_precision
       @connection.create_table(:foos, force: true) do |t|
+        t.datetime :datetime_zero, precision: 0
         t.timestamps precision: 6
       end
       output = dump_table_schema("foos")
-      assert_match %r{t\.datetime\s+"created_at",\s+precision: 6,\s+null: false$}, output
-      assert_match %r{t\.datetime\s+"updated_at",\s+precision: 6,\s+null: false$}, output
+      assert_match %r{t\.datetime\s+"datetime_zero",\s+precision: 0$}, output
+      assert_match %r{t\.datetime\s+"created_at",\s+null: false$}, output
+      assert_match %r{t\.datetime\s+"updated_at",\s+null: false$}, output
     end
 
     if current_adapter?(:PostgreSQLAdapter, :SQLServerAdapter)
diff --git a/activerecord/test/cases/defaults_test.rb b/activerecord/test/cases/defaults_test.rb
index b140b2f83eb63..0b010ff8716cc 100644
--- a/activerecord/test/cases/defaults_test.rb
+++ b/activerecord/test/cases/defaults_test.rb
@@ -143,7 +143,7 @@ class MysqlDefaultExpressionTest < ActiveRecord::TestCase
     if supports_datetime_with_precision?
       test "schema dump datetime includes default expression" do
         output = dump_table_schema("datetime_defaults")
-        assert_match %r/t\.datetime\s+"modified_datetime",\s+default: -> { "CURRENT_TIMESTAMP(?:\(\))?" }/i, output
+        assert_match %r/t\.datetime\s+"modified_datetime",\s+precision: 0,\s+default: -> { "CURRENT_TIMESTAMP(?:\(\))?" }/i, output
       end
 
       test "schema dump datetime includes precise default expression" do
diff --git a/activerecord/test/cases/primary_keys_test.rb b/activerecord/test/cases/primary_keys_test.rb
index 1707126f125cd..67dc72f02e9b8 100644
--- a/activerecord/test/cases/primary_keys_test.rb
+++ b/activerecord/test/cases/primary_keys_test.rb
@@ -321,7 +321,7 @@ def test_any_type_primary_key
     test "schema typed primary key column" do
       @connection.create_table(:scheduled_logs, id: :timestamp, precision: 6, force: true)
       schema = dump_table_schema("scheduled_logs")
-      assert_match %r/create_table "scheduled_logs", id: { type: :timestamp, precision: 6.* }/, schema
+      assert_match %r/create_table "scheduled_logs", id: { type: :timestamp.* }/, schema
     end
   end
 end
diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb
index 19d339ea15150..9ee88adf64bce 100644
--- a/activerecord/test/cases/schema_dumper_test.rb
+++ b/activerecord/test/cases/schema_dumper_test.rb
@@ -840,7 +840,7 @@ def test_schema_dump_defaults_with_universally_supported_types
     assert_match %r{t\.date\s+"date_with_default",\s+default: "2014-06-05"}, output
 
     if supports_datetime_with_precision?
-      assert_match %r{t\.datetime\s+"datetime_with_default",\s+precision: 6,\s+default: "2014-06-05 07:17:04"}, output
+      assert_match %r{t\.datetime\s+"datetime_with_default",\s+default: "2014-06-05 07:17:04"}, output
     else
       assert_match %r{t\.datetime\s+"datetime_with_default",\s+default: "2014-06-05 07:17:04"}, output
     end