diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index d060e186..33c0f10b 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -224,7 +224,13 @@ def _run_hooks(config, hooks, args, environ):
                 '`pre-commit install`.',
             )
         output.write_line('All changes made by hooks:')
-        subprocess.call(('git', '--no-pager', 'diff', '--no-ext-diff'))
+        # args.color is a boolean.
+        # See user_color function in color.py
+        subprocess.call((
+            'git', '--no-pager', 'diff', '--no-ext-diff',
+            '--color={}'.format({True: 'always', False: 'never'}[args.color]),
+        ))
+
     return retval
 
 
diff --git a/tests/commands/run_test.py b/tests/commands/run_test.py
index b465cae6..fc2a973c 100644
--- a/tests/commands/run_test.py
+++ b/tests/commands/run_test.py
@@ -187,6 +187,13 @@ def test_global_exclude(cap_out, store, tempdir_factory):
             },
             b'All changes made by hooks:',
         ),
+        (
+            {
+                'show_diff_on_failure': True,
+                'color': True,
+            },
+            b'All changes made by hooks:',
+        ),
         (
             {
                 'show_diff_on_failure': True,