diff --git a/httpie/__init__.py b/httpie/__init__.py
index 0725cc15..f4b9b042 100644
--- a/httpie/__init__.py
+++ b/httpie/__init__.py
@@ -8,8 +8,8 @@ __licence__ = 'BSD'
 
 
 class ExitStatus:
-    """Exit status code constants."""
-    OK = 0
+    """Program exit code constants."""
+    SUCCESS = 0
     ERROR = 1
     PLUGIN_ERROR = 7
 
diff --git a/httpie/core.py b/httpie/core.py
index 8442d614..8ad0e2a6 100644
--- a/httpie/core.py
+++ b/httpie/core.py
@@ -43,7 +43,7 @@ def get_exit_status(http_status, follow=False):
         # Server Error
         return ExitStatus.ERROR_HTTP_5XX
     else:
-        return ExitStatus.OK
+        return ExitStatus.SUCCESS
 
 
 def print_debug_info(env):
@@ -82,7 +82,7 @@ def program(args, env, log_error):
     :return: status code
 
     """
-    exit_status = ExitStatus.OK
+    exit_status = ExitStatus.SUCCESS
     downloader = None
     show_traceback = args.debug or args.traceback
 
@@ -109,7 +109,7 @@ def program(args, env, log_error):
                     http_status=response.status_code,
                     follow=args.follow
                 )
-                if not env.stdout_isatty and exit_status != ExitStatus.OK:
+                if not env.stdout_isatty and exit_status != ExitStatus.SUCCESS:
                     log_error(
                         'HTTP %s %s', response.raw.status, response.raw.reason,
                         level='warning'
@@ -143,7 +143,7 @@ def program(args, env, log_error):
                 else:
                     raise
 
-        if downloader and exit_status == ExitStatus.OK:
+        if downloader and exit_status == ExitStatus.SUCCESS:
             # Last response body download.
             download_stream, download_to = downloader.start(final_response)
             write_stream(
@@ -202,9 +202,9 @@ def main(args=sys.argv[1:], env=Environment(), custom_log_error=None):
     if include_debug_info:
         print_debug_info(env)
         if args == ['--debug']:
-            return ExitStatus.OK
+            return ExitStatus.SUCCESS
 
-    exit_status = ExitStatus.OK
+    exit_status = ExitStatus.SUCCESS
 
     try:
         parsed_args = parser.parse_args(args=args, env=env)
@@ -214,7 +214,7 @@ def main(args=sys.argv[1:], env=Environment(), custom_log_error=None):
             raise
         exit_status = ExitStatus.ERROR_CTRL_C
     except SystemExit as e:
-        if e.code != ExitStatus.OK:
+        if e.code != ExitStatus.SUCCESS:
             env.stderr.write('\n')
             if include_traceback:
                 raise
@@ -232,7 +232,7 @@ def main(args=sys.argv[1:], env=Environment(), custom_log_error=None):
                 raise
             exit_status = ExitStatus.ERROR_CTRL_C
         except SystemExit as e:
-            if e.code != ExitStatus.OK:
+            if e.code != ExitStatus.SUCCESS:
                 env.stderr.write('\n')
                 if include_traceback:
                     raise
diff --git a/tests/test_exit_status.py b/tests/test_exit_status.py
index 119b8d12..02e9bd73 100644
--- a/tests/test_exit_status.py
+++ b/tests/test_exit_status.py
@@ -21,13 +21,13 @@ def test_keyboard_interrupt_in_program_exit_status(httpbin):
 def test_ok_response_exits_0(httpbin):
     r = http('GET', httpbin.url + '/get')
     assert HTTP_OK in r
-    assert r.exit_status == ExitStatus.OK
+    assert r.exit_status == ExitStatus.SUCCESS
 
 
 def test_error_response_exits_0_without_check_status(httpbin):
     r = http('GET', httpbin.url + '/status/500')
-    assert '500 INTERNAL SERVER ERRO' in r
-    assert r.exit_status == ExitStatus.OK
+    assert '500 INTERNAL SERVER ERROR' in r
+    assert r.exit_status == ExitStatus.SUCCESS
     assert not r.stderr
 
 
@@ -55,7 +55,7 @@ def test_3xx_check_status_redirects_allowed_exits_0(httpbin):
              error_exit_ok=True)
     # The redirect will be followed so 200 is expected.
     assert HTTP_OK in r
-    assert r.exit_status == ExitStatus.OK
+    assert r.exit_status == ExitStatus.SUCCESS
 
 
 def test_4xx_check_status_exits_4(httpbin):
diff --git a/tests/test_httpie.py b/tests/test_httpie.py
index 5fb045b9..c6bf0019 100644
--- a/tests/test_httpie.py
+++ b/tests/test_httpie.py
@@ -10,19 +10,19 @@ import httpie
 
 def test_debug():
     r = http('--debug')
-    assert r.exit_status == httpie.ExitStatus.OK
+    assert r.exit_status == httpie.ExitStatus.SUCCESS
     assert 'HTTPie %s' % httpie.__version__ in r.stderr
 
 
 def test_help():
     r = http('--help', error_exit_ok=True)
-    assert r.exit_status == httpie.ExitStatus.OK
+    assert r.exit_status == httpie.ExitStatus.SUCCESS
     assert 'https://github.com/jakubroztocil/httpie/issues' in r
 
 
 def test_version():
     r = http('--version', error_exit_ok=True)
-    assert r.exit_status == httpie.ExitStatus.OK
+    assert r.exit_status == httpie.ExitStatus.SUCCESS
     # FIXME: py3 has version in stdout, py2 in stderr
     assert httpie.__version__ == r.stderr.strip() + r.strip()
 
diff --git a/tests/test_output.py b/tests/test_output.py
index d57e891c..26cbae96 100644
--- a/tests/test_output.py
+++ b/tests/test_output.py
@@ -161,7 +161,7 @@ class TestLineEndings:
 
     def test_CRLF_formatted_response(self, httpbin):
         r = http('--pretty=format', 'GET', httpbin.url + '/get')
-        assert r.exit_status == ExitStatus.OK
+        assert r.exit_status == ExitStatus.SUCCESS
         self._validate_crlf(r)
 
     def test_CRLF_ugly_request(self, httpbin):
diff --git a/tests/utils.py b/tests/utils.py
index 0c31c966..c9b3575e 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -219,7 +219,7 @@ def http(*args, **kwargs):
             sys.stderr.write(stderr.read())
             raise
         else:
-            if not error_exit_ok and exit_status != ExitStatus.OK:
+            if not error_exit_ok and exit_status != ExitStatus.SUCCESS:
                 dump_stderr()
                 raise ExitStatusError(
                     'httpie.core.main() unexpectedly returned'
@@ -243,7 +243,7 @@ def http(*args, **kwargs):
         r.stderr = stderr.read()
         r.exit_status = exit_status
 
-        if r.exit_status != ExitStatus.OK:
+        if r.exit_status != ExitStatus.SUCCESS:
             sys.stderr.write(r.stderr)
 
         return r